CN104722053B - Butterfly swimming stroke land training instrument - Google Patents
Butterfly swimming stroke land training instrument Download PDFInfo
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- CN104722053B CN104722053B CN201510114485.1A CN201510114485A CN104722053B CN 104722053 B CN104722053 B CN 104722053B CN 201510114485 A CN201510114485 A CN 201510114485A CN 104722053 B CN104722053 B CN 104722053B
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- stroke
- butterfly
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- track
- arm
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Abstract
The invention discloses a butterfly swimming stroke land trainer. The butterfly swimming stroke land training instrument comprises a support frame and a bumping track; a plurality of middle shafts are arranged on the support frame, the middle shafts are all sleeved with a long-shaft bearing, and the middle shafts are parallelly arranged in a row to form a middle shaft board; one or more driving gears meshed with the bumping track are arranged on the end portion of the middle shaft board; the bumping track comprises a track body surrounded on the middle shaft board, a plurality of bumpings with different height are arranged on the outer surface of the track body, and the bumpings are arrayed in order to make the top ends of the bumpings connect together to form a relatively smooth corrugated curved surface, a plurality of lifting plates are arranged on each bumping, and all the lifting plates are connected together to form a lifting track; a corrugated sports flexible structure for a trainer to lie prostrate and move up and down along with the bumping track is arranged on the lifting track; a guide orbit which is consistent with the arm pulling of the butterfly stroke is arranged outside the support frame. The butterfly swimming stroke land trainer makes the trainer to achieve a set of underwater butterfly swimming stroke actions which are standard, complete and continuous on the land.
Description
Technical field
The invention belongs to field of sports equipment is and in particular to a kind of butterfly stroke stroke land practice device.
Background technology
Butterfly stroke is one of swimming event, and practitioner is divided into following main points in exercise：
1st, the breathing of butterfly stroke, general double arm pull 1 time, breathe 1 time.Arm starts slowly to exhale after entering water, when two-arm embraces water
When terminating inwardly to strike, start to come back.Strike backward with two-arm, the position of head and shoulder gradually rises, exhale also from slow to fast
Ground is carried out, and continues to come back forward.When two hands are struck to lower abdominal, chin surfaces and along water surface extension, when two hands
Push away water to terminate to dehisce during arm water outlet air-breathing, hold one's breath with bowing when takeing on into a horizontal line to moving forward in two-arm, hand enters head during water and submerges
Feel suffocated in water.During butterfly stroke majority using lifting head to breathe, high performance athlete typically lifts head to breathe in arm pushing water, in the air
During displacement arm, head stretches with shoulder forward downward, bows before hand enters water.
2nd, arm technology and exercise：Butterfly stroke arm action can be divided into into water, Bao Shui, strike, water outlet, five portions of aerial displacement arm
Point.
（1）Enter water.Butterfly stroke correctly enters water position should be on the extended line of two shoulders or the extended line be slightly narrower than shoulder, two hands
Place of entry too wide so that paddling line is shortened, too narrow be unfavorable for water after strike and embrace water.Entering water should be leading with thumb, two hands
The palm simultaneously symmetrically oblique cutting enter water, then forearm and upper arm enter water successively.Enter elbow joint during water slight curving, the centre of the palm is towards under outer
Side, palm about becomes 40 ° of angles with the water surface
（2）Embrace water：After arm enters water, as far as possible along the water surface to extension shoulder and semi-girder, two hands and forearm inward turning outer point, outwards
Strike backward.When draw outside two hands to exceed shoulder breadth when, wrist flexion, make palm from be changed into outwards, backward outwards, downwardly and rearwardly, with
When bend elbow complete embrace hydrodynamic(al) make.Embracing water course of action similarly is to go to embrace a big ball with arm, forms the appearance of high elbow before head
Gesture, so can make the big muscles such as latissimus dorsi, musculus teres major elongate in advance, the Main Stage for striking is ready.
（3）Strike：After carrying out the action embracing water, arm continues to bend elbow, and keeps high elbow posture, the direction of motion of hand from
Downwards, switch to outwards, backward inwardly, upwardly and rearwardly.Conveniently towards the stroke of interior top, elbow degree in the wrong is gradually increased, and works as hand
When arm draws the lower section to shoulder, elbow joint bending is in 90 °～100 ° of angles, the distance between two hands are recently.Then arm inward turning, from former
Come inside, upwards, rearward switch to outwards, the stroke of upwardly and rearwardly side, striking at this moment will gradually be stretched elbow, stretch wrist, makes
Forearm and hand are tried one's best and are kept to water.When hand draws thigh both sides, arm stroke terminates, and proceeds to water outlet.
Process two palmistry of entirely striking of butterfly stroke is curve in double S types for the movement locus of body（According to different power
Amount type sportsman, process two palmistry of entirely striking of butterfly stroke is curve or straight line in double C-type for the movement locus of body
Type）.The propulsive force that stage of striking produces is maximum, and application peak power and prestissimo complete.
（4）Water outlet：At the end of hand is struck not yet, elbow has begun to leave the water surface.When two hands draw thigh both sides, utilize
The inertia struck, shoulder belt arm of starting proposes elbow water outlet.During water outlet, palm inward, towards the inner side of thigh, little finger of toe is leading, with less
Section water outlet, reduce water outlet resistance.Although the arm pull of butterfly stroke and crawl similar, also there is difference.Crawl push away water be to
Afterwards, up and out in thigh branch water, and butterfly stroke both hands draw under abdomen just outwards, push away water back, up, in hip branch water.Push away
Water and water outlet are very round and smooth actions, if hand draw empress dowager will think that water outlet is highly difficult and affects displacement arm.
（5）Aerial displacement arm：After overhand, aerial forward along low flat parabola warp in body both sides under the drive of shoulder
Before swinging to the end, the hydrodynamic(al) that enters going to next cycle action is made.During displacement arm, shoulder should surface, and arm is certainly
So stretch, forearm and wrist natural relaxation, thumb down, drives forearm forward swing by upper arm.Because butterfly stroke two-arm is simultaneously to reach
Dynamic, therefore it is relatively good to get rid of forward arm using low flat natural straight-arm posture from both sides.
3rd, leg techniques and exercise：Butterfly stroke leg and leg of crawling have similarity, but the complete cooperation to butterfly stroke for the butterfly stroke kick
Role ratio is crawled big.Additionally, the degree that butterfly stroke leg is gone down on one's knees when fetching water is more than crawling.
The footwork of butterfly stroke is to be had an effect by trunk, through the momentum transmission of hip, SCID Mice, each several part cooperation
Form awave action, it advances for the good body gesture of holding and propulsion body highly important effect.Butterfly
When swimming is fetched water, two legs close up naturally, and bipod revolves into interior eight words slightly within, and the action of two legs should be carried out simultaneously, are otherwise and break the rules.
Butterfly stroke leg is formed with two parts of fetching water downwards by fetching water upwards.When before two legs once at the end of footwork downwards,
Bipod is in minimum point, and knee joint stretches, and buttocks rises to the water surface, and hip joint bends into about 160 ° of angles.Then two legs stretch upwards
Swing, hip joint gradually spreads out, when thigh rises to trunk in line, waist abdomen and buttocks start to sink, and thigh starts
Push.When thigh pushes, bipod and shank are continued up due to the effect of inertia, and knee joint forms natural torsion.With big
Leg continues to accelerate downwards, and degree of going down on one's knees increases, until pin rises to close to the water surface, about 4～5 centimeters under water, and now stern subordinate
It is sink to minimum point, knee joint bends into 110 ° ~ 130 ° angles, end of at this moment fetching water upwards.
Accelerate to push with thigh, pin and shank are beaten under accelerating to the back lower place under the drive of thigh, up to shank and pin
Knee joint of fetching water downwards stretches completely, and pin is in minimum point.Fetch water downwards the process being to stretch knee, under shank and pin accelerate backward
Fetch water, just as whip gets rid of at the bottom of pond in side.Ankle-joint plantar flexion sole inward turning when fetching water downwards, the pliability of ankle-joint and flexibility
To fetching water, effect plays an important role.Fetching water downwards is the Main Stage of generation propulsive force, accelerate to complete.Fetch water downwards end,
Enter the sampling action that the next one is fetched water again.Fetching water upwards and fetching water downwards does not have obvious boundary line：When shank and pin upwards
Footwork also not at the end of, thigh has begun to fetch water downwards；Shank and the downward footwork of pin also not at the end of, thigh
Have begun to pendulum, enter and fetch water upwards.Trunk is linked up with leg action and could form the action of wave.
The body gesture of butterfly stroke is different from other strokes, the body position that it is not fixed.Swim in trunk each several part
With head constantly change relative position to each other.Head and trunk sometimes surface, sometimes pull the plug, and are formed in wave pattern
The change location of lower fluctuating.Butterfly stroke, in You Jinzhong, is with transverse axis（Waist border）Centered on, trunk and leg do rhythmical swing, send out
Force is in waist and belly.Then shank is driven with thigh, two legs do upper and lower whiplike footwork together.And these actions and head and
The action of arm is closely connected together, forms wave action specific to butterfly stroke.This undaform moves in butterfly stroke stroke
Very important effect is served on specification, if body swing does not reach the shape of wave in butterfly stroke, then not
Meet the primitive rule of butterfly stroke.
At present in butterfly stroke training process, all using land stand, in prostrate or water resolve exercise arm strike, body
Wave oscillating, leg such as are fetched water at the action, and the action of complete a cycle needs in water just can be practised, but in trip
At the swimming initial stage, practice effect in water for a lot of students is unsatisfactory.Existing patent application（As Chinese patent CN203777639）
Disclose a kind of land swimming simulating machine, but its shortcoming be for butterfly stroke stroke training effect undesirable it is impossible to simulation shape
Become Wave curved specific to butterfly stroke, and completely continuous action can not be practised.
Content of the invention
The present invention overcomes the deficiencies in the prior art, provides a kind of butterfly stroke stroke land practice device, not only can real mould
Intend the action in water, and can be implemented in the land exercise complete sports technique exercise of butterfly stroke.
A kind of butterfly stroke stroke land practice device, including：
The bracing frame matching with practitioner's front lying position and projection crawler belt；
Wherein, support frame as described above is provided with some axis being all cased with long axle bearing, and described axis a row arranged side by side form
Middle axillare；
The end of described middle axillare is provided with the driving gear that at least one is meshed with described projection crawler belt；
Described projection crawler belt includes the track body being looped around on middle axillare, the outer surface of track body is arranged some high
The low projection not waited, the projection ordered arrangement that described height does not wait makes all projection tops form a relative smooth after connecting together
Wave curved surface；
Be equipped with above described projection some lift plate, all lift plate and be joined together to form lift crawler belt, described support
The two ends lifting crawler belt are separately fixed on bracing frame；
Described lifting is provided with practitioner for prostrate and can do dipping and heaving with projection crawler belt waveform fortune above crawler belt
Dynamic flexible structure；
Support frame as described above is externally provided with the guide rails consistent with butterfly stroke arm paddling line, arm along guide rails make with
The curvilinear motion that actual butterfly stroke arm action track is consistent；
Described driving gear is connected with driving means.
Described guide rails include two single guide rails of middle connection, and described single guide rails are closings, by two
Section hard tube and two sections of hard flexible pipes are formed by connecting.
Described hard flexible pipe is located at the part of practitioner's trunk, wherein institute near practitioner's head and foot, described hard tube
State within hard flexible pipe insertion hard tube.The shape of flexible modulation hard flexible pipe and length, meet different arm length or difference
The demand of strength type practitioner.
Adjust shape and the length of guide rails, described guiding according to the practitioner of different strength types and different arm length
The orthographic projection in level ground for the track is in double S molded line bars or double C-type lines or bilinear.
Described flexible structure is preferably foam-rubber cushion or soft rubber pad.
Upper surface one end of described flexible structure is provided with the head pad being surrounded by annular projection, and described head pad is used for
Accommodate face.
Described driving means are reducing motor, provide power for driving gear.
Described middle axillare be respectively arranged at the two ends with a driving gear.
Described lifting is provided with some roller bearings between plate and described projection, described roller bearing links together, and lifts
Plate is arranged in roller bearing, when projection is through out-of-date, due to the effect of roller bearing, so that convex portion can be passed through.
When using, start driving means, driving means drive the rotation of driving gear, driving gear drives projection crawler belt
Rotate, practitioner prostrate in flexible structure, arm makees double S types along guide rails（Or double C-type, linear pattern）Curvilinear motion, convex
Block crawler belt drive flexible structure do dipping and heaving waveform motion, the present invention can with the movement locus of simulation water Wave line,
So that practitioner realizes a set of standard and completely continuous action in water by land, make the land drill situation of butterfly stroke and in water
The situation of middle actual swimming is consistent.
The invention has the beneficial effects as follows：
（1) practitioner, prostrate start driving gear on training aids, drive projection crawler belt to rotate, flexible structure can be with
Dipping and heaving, form waveform motion, can the motion state that needs in water of the person of doing simulated exercises, meet practitioner's body ripple
Shape wave movement needs.And corrugated motion meets the footwork of butterfly stroke, this action is through hip, SCID Mice
Momentum transmits, and each several part cooperation forms awave action, the corrugated fortune of this awave action and flexible structure
Dynamic consistent, so that footwork more codes and standards.
（2）Setting arm paddling line guide rails, practitioner's arm can move according to action request, cooperation waist, leg
Make, make arm stroke along arm paddling line guide rails, thus realizing the double S type or double of simulated training butterfly stroke stroke on land
C-type or double-lined type arm motion track, and can be moved with the arm of specification practitioner according to arm paddling line guide rails
Make, effectively improve practice effect, make arm action more standard, the perfection of practitioner.
（3）Arm paddling line guide rails can be adjusted according to different arm length and different strength type practitioner
Length or shape, movement, meet many demands, applied widely.
（4）The present invention not only can simulation water Wave curve movement locus, and can be with practice arm action, trunk
Action and footwork etc., make practitioner realize a set of standard in water and completely continuous action by land.
Brief description
Fig. 1 is present configuration stereogram.
Fig. 2 is side view of the present invention.
Fig. 3 is head pad schematic diagram of the present invention.
Fig. 4 is the structural representation of the present invention when using.
Fig. 5 is the structural representation lifting crawler belt of the present invention.
Fig. 6 to 8 is practitioner arm motion track in butterfly stroke.
Fig. 9 is that the present invention lifts crawler belt and is fixed on the structural representation on bracing frame.
Figure 10 is the part-structure schematic diagram of projection crawler belt of the present invention.
Figure 11 is that the present invention lifts crawler belt interior roller bearing schematic diagram.
Figure 12 is the structural representation that driving gear of the present invention is installed.
Wherein, 1, bracing frame, 2, projection crawler belt, 2-1, track body, 2-2, projection, 3, axis, 4, driving gear, 5, support
Lift crawler belt, 6, lift plate, 7, flexible structure, 8, guide rails, 8-1, hard flexible pipe, 8-2, hard tube, 9, head pad.
Specific embodiment
Embodiment 1
The present invention is further described with reference to the accompanying drawings and examples.
As shown in Fig. 1, Fig. 2 and Figure 10, a kind of butterfly stroke stroke land practice device, including：
The bracing frame 1 matching with practitioner's front lying position and projection crawler belt 2；
Wherein, support frame as described above 1 is provided with some axis 3 being all cased with long axle bearing, described axis 3 row's shape arranged side by side
Axillare in one-tenth；
As shown in Fig. 9 and 12, the both ends of described middle axillare are respectively provided with an active being meshed with described projection crawler belt 2
Gear 4；
Described projection crawler belt 2 includes the track body 2-1 being looped around on middle axillare, if arranging on the outer surface of track body
The projection 2-2 that dry height does not wait, after the projection 2-2 ordered arrangement that described height does not wait makes all projection 2-2 tops connect together
Form the wave curved surface of a relative smooth.
As shown in figure 5, being equipped with one above each described projection 2-2 to lift plate 6, all plates 6 of lifting link together
Crawler belt 5 is lifted in formation, and the described two ends lifting crawler belt 5 are separately fixed on bracing frame 1；
Described crawler belt 5 of lifting is provided with practitioner above for prostrate and can do dipping and heaving with projection crawler belt 2 waveform
Motion flexibility structure 7；
Support frame as described above 1 is externally provided with the guide rails 8 consistent with butterfly stroke arm paddling line, and arm is along guide rails 8
Make the curvilinear motion being consistent with actual butterfly stroke arm action track；
Described driving gear 4 is connected with driving means, and described driving means are reducing motor, provide for driving gear 4
Power.
Described guide rails 8 include two single guide rails of middle connection, and described single guide rails are closings, by two
Section hard tube 8-2 and two sections of hard flexible pipe 8-1 is formed by connecting, and described hard flexible pipe 8-1 is enclosed within described hard tube 8-2.
Described hard flexible pipe 8-1 near practitioner's head and foot, described hard tube 8-2 be located at practitioner's trunk portion
Point, within wherein said hard flexible pipe 8-1 insertion hard tube 8-2.According to the difference of practitioner's arm length or strength, can be by
Hard flexible pipe 8-1 part does suitable adjustment, meets the needs of different practitioners；Guide rails 8 are to be consolidated by mounting bracket
It is scheduled on outside bracing frame 1, mounting bracket can move, adjusts the position of guide rails at any time, meet the demand of different practitioners.
As shown in figs 6-8, in butterfly stroke, the arm stroke mode of arm according to the sportsman of different strength be divided into linear pattern,
" C " type and " S " type, " S " type is suitable for power-type sports person it is adaptable to 50 meters of athletic competitions；" C " type is suitable for medium strength type
Sportsman.It is applied to 100 meters of athletic competitions；Linear pattern is suitable for universal weight machine type sportsman.It is applied to 200 meters of athletic competitions.
When hand adjusts paddling line according to the strength size of practitioner（Strike road including adjustment " straight line ", " C " type, " S " type
Line）, as the hard flexible pipe 8-1 of front end, become generation " C " type from " S " type（Or " straight line " type）When, " having more than needed " hard can be produced soft
During pipe 8-1, now, hard flexible pipe 8-1 is drawn in hard tube 8-2, by hard flexible pipe 8-1 digestion more than needed for front end.
When the hard flexible pipe 8-1 of front end becomes " C " type from " straight line " type（Or " S " type）When, front end flexible pipe overall length can be not enough,
Now, pull hard flexible pipe 8-1 from front end, hard flexible pipe 8-1 more than needed for rear end is retracted, meets deformation demand, thus meeting not
Same strength, brachium, the change demand of different paddling lines.Can according to the manner of execution linear pattern of freestyle swimming arm, " C " type with
" S " type, is adjusted, and meanwhile, according to the difference of practitioner's arm length, arm paddling line guide rails can also be adjusted
Section, meets many demands.
As shown in figure 3, described flexible structure 7 is preferably foam-rubber cushion, upper surface one end of foam-rubber cushion is provided with by annular projection
The head pad 9 surrounding, described head pad 9 is used for accommodating face, is easy to fixing position on foam-rubber cushion for the practitioner.
Preferably, as shown in figure 11, described lifting designs some roller bearings between plate 6 and described projection 2-2, described
Roller bearing links together, and lifts plate and is arranged in roller bearing, when projection 2-2 is through out-of-date, due to the effect of roller bearing,
So that projection 2-2 partly can be passed through.
As shown in figure 4, use when, start driving means, driving means drive driving gear rotation, driving gear and
The driven gear drive projection crawler belt that cooperates rotates, practitioner prostrate in flexible structure, arm is double S along guide rails
Type, double C-type or linear pattern curvilinear motion, projection crawler belt drives flexible structure to do the waveform motion of dipping and heaving, the present embodiment
Can the person's of doing simulated exercises body water Wave line movement locus so that practitioner realize by land in water a set of standard and
Completely continuous action, makes the land drill of butterfly stroke consistent with the situation of swimming actual in water.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of butterfly stroke stroke land practice device, is characterized in that, including：
The bracing frame matching with practitioner's front lying position and projection crawler belt；
Wherein, support frame as described above is provided with some axis being all cased with long axle bearing, and a described axis row arranged side by side forms axis
Plate；
The end of described middle axillare is provided with the driving gear that at least one is meshed with described projection crawler belt；
Described projection crawler belt includes the track body being looped around on middle axillare, and the outer surface of track body arranges some height not
Deng projection, the projection ordered arrangement ripple that makes all projection tops form a relative smooth after connecting together that described height does not wait
Unrestrained curved surface；
Be equipped with above described projection some lift plate, all lift plate and be joined together to form lift crawler belt, described lift shoe
The two ends of band are separately fixed on bracing frame；
Described lift be provided with above crawler belt practitioner for prostrate and can with projection crawler belt do dipping and heaving waveform motion soft
Property structure；
Support frame as described above is externally provided with the guide rails consistent with butterfly stroke arm paddling line, and arm is made and reality along guide rails
The curvilinear motion that butterfly stroke arm action track is consistent；
Described driving gear is connected with driving means.
2. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described guide rails include middle connection
Two single guide rails, described single guide rails are closings, are formed by connecting by two sections of hard tubes and two sections of hard flexible pipes.
3. butterfly stroke stroke land practice device as claimed in claim 2, is characterized in that：Described hard flexible pipe is near practitioner's head
And foot, described hard tube is located at the part of practitioner's trunk, within wherein said hard flexible pipe insertion hard tube.
4. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described guide rails are in level ground just
Projection is in double S molded line bars.
5. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described guide rails are in level ground just
Projection is in double C-type lines.
6. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described flexible structure is foam-rubber cushion.
7. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described flexible structure is soft rubber pad.
8. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Upper surface one end of described flexible structure sets
There is the head pad being surrounded by annular projection, described head pad is used for accommodating face.
9. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described driving means are reducing motor, are
Driving gear provides power.
10. butterfly stroke stroke land practice device as claimed in claim 1, is characterized in that：Described middle axillare be respectively arranged at the two ends with one
Individual driving gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114485.1A CN104722053B (en) | 2015-03-16 | 2015-03-16 | Butterfly swimming stroke land training instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114485.1A CN104722053B (en) | 2015-03-16 | 2015-03-16 | Butterfly swimming stroke land training instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104722053A CN104722053A (en) | 2015-06-24 |
| CN104722053B true CN104722053B (en) | 2017-02-22 |
Family
ID=53446837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510114485.1A Expired - Fee Related CN104722053B (en) | 2015-03-16 | 2015-03-16 | Butterfly swimming stroke land training instrument |
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| CN (1) | CN104722053B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107115653B (en) * | 2016-11-03 | 2023-04-28 | 京东方科技集团股份有限公司 | Device for adjusting swimming stroke, swimming stroke information processing system and swimming stroke information processing method |
| CN110585680A (en) * | 2019-08-19 | 2019-12-20 | 武汉体育学院 | Land trainer for free swimming |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124272A (en) * | 1993-11-02 | 1995-05-16 | Noriyuki Kimijima | Beat board |
| CN202427091U (en) * | 2011-11-24 | 2012-09-12 | 无锡翔煜科技有限公司 | Butterfly-stroke whole-body exercise apparatus |
| CN203989781U (en) * | 2014-08-12 | 2014-12-10 | 西安理工大学 | Butterfly stroke stroke simulation trainer |
| CN104368140A (en) * | 2014-09-17 | 2015-02-25 | 郭立三 | Butterfly stroke learning device |
| CN204601558U (en) * | 2015-03-16 | 2015-09-02 | 山东师范大学 | Butterfly stroke stroke land practice device |
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