2 phases of movement
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Transcript of 2 phases of movement
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Phases of Movement
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Movements can be broken down into distinct phases1. Preliminary movements. 2. Back-swing or recovery. 3. Force producing movements. 4. The critical impact instant. 5. The follow-through.
Phases of Movement
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Phases of Movement
1. Preliminarymovements
2. Backswing
3. Force producing movements
4. Moment of impact
5. Follow through
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Can you identify the phases of movement in this stroke?
In pairs, write out on a piece of paper what you think the different phases of the freestyle
stroke are.
Freestyle Swimming Stroke
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The freestyle arm stroke consists of five phases:
1. Entry 2. Catch 3. Pull 4. Follow-through 5. Recovery
Freestyle Phases
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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The arm enters the water directly in front of the shoulder, with the elbow bent so it is higher than the hand. The hand enters at about a thirty-degree angle as "quietly" as possible; the key is to try to avoid slapping the water.
The fingertips enter first, thumb down, and the palm tilted out slightly. Then the arm slides forward and slightly downward, until it is fully extended.
1. Entry
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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The catch is made as soon as the elbow is completely extended. As the elbow begins to flex, the wrist should turn downward so that the fingertips point toward the bottom of the pool. The hands should scull out slightly before beginning the pull. Although doing this is not necessary, coaches and swimmers will argue that it improves their pull.
2. The Catch
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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The pull should start as soon as a "catch" of the water is made. As the pull begins the hand, forearm, and upper arm will grab an armful of water, almost as if it is reaching around a very large barrel, always remembering to keep the elbow high move the hand backward in an S-pattern, past the shoulders and then under the body. Remember not to let the pull cross the body's centerline, as this will disturb the body position. As the hand passes beneath the shoulders, the elbow achieves its maximum bend - about ninety degrees.
3. The Pull
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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Throughout the pull, the hand accelerates to increase the body's speed. Now, in the follow-through, continuing that acceleration, the hand should push past back the hips. This should be a hard-accelerated push. As the arm straightens and extends to finish the stroke the palm should be facing the feet. This will allow the hand to exit the water most easily.
4. The Follow-Through
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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The final phase of the arm stroke, the recovery, is a smooth, rounded movement in which the stroke continues into the air. It begins as the elbow leaves the water, followed by the shoulder and then the hand. The elbow should remain higher than the hand throughout the recovery, and the hand should be just over the surface of the water. The elbow should be the highest point over the body.
The arm should remain completely relaxed throughout the recovery. Allowing momentum to carry it forward. As the recovery is completed, the hand enters the water again at about a thirty-degree angle, fingertips first, thumb down, palm tilted out
5. The Recovery
http://members.fortunecity.com/magnusdr/coaching/freestyle.html
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NAMES OF PERIODS & PHASES:
Left armstroke period1. Left pull & right recovery phase2. Left push & right recovery phase
Right armstroke period3. Right pull & left recovery phase4. Right push & left recovery phase
Freestyle Swimming Stroke
http://www.swim.ee/models/_free_swim1.html
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Avoid unnecessary movements during all phases Optimum alterations of action and relaxation of
muscles during stroke and recovery actionsIncrease propulsive forces by strokes and kicks
Decrease resistance to the body all times Ensure rigid transfer of power from strokes and kicks
to the body through locked joints with correct timing Realize aims of movements in each phase but also
prepare for the movements in following phase
General tips
http://www.swim.ee/models/_free_swim1.html
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Inhale during first part of arm recovery when pulling with other arm
Hold the breath - during arm entry and pull when recovering other arm
Exhale - during push when other arm entersNext Inhale - as before
Co-ordinate good breathing actions with movements as follows:
http://www.swim.ee/models/_free_swim1.html
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Aim of movements: try to increase forward speed
Limiting positions: Beginning: at the start of arm pull Ending: at the end of arm push
ARMSTROKE PERIOD (Left or Right)
http://www.swim.ee/models/_free_swim1.html
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Forward movement during stroke: 1.1 - 1.45 (m) (This parameter indicates how effective is swimmers stroke. It must be half from full cycle stroke length)
Relative stroke speed of hand backward: (-0.6) - (-0.1) (m/sec)(If arm stroke is effective and rational, then hands horizontal speed component backward during stroking, related to water, must be slow to create high body speed forward)
Parameters:
http://www.swim.ee/models/_free_swim1.html
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Make stroke soft at the beginning with acceleration at the end, with good water feeling and low relative hand speed , sticking to water
Make recovery also with acceleration, opposite to the stroking arm, through fixed shoulder line (kayaking principle)
Keep the body position flat and high Make 1-3 leg kicks during one arm stroke period Move forward during stroke as much as possible Combine inhaling with recovery and pulling actions of arm,
exhaling with arm pushing action
Tips
http://www.swim.ee/models/_free_swim1.html
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1. ARM PULL & RECOVERY PHASE
Phases
http://www.swim.ee/models/_free_swim1.html
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Requirements for self control:
The timing of catch action must be simultaneously with opposite side leg kick
The position of shoulder at the beginning of the pull must be relatively high
http://www.swim.ee/models/_free_swim1.html
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Requirements for self control:The action of arm at the beginning of pull must be with good
catch forward , with high elbow position
The action of leg kick during the pull must be relatively soft kick or cross-over actions,
http://www.swim.ee/models/_free_swim1.html
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Requirements for self control:Hand slip during pull must be positive, gliding forward, let body
move on your pull, stretching elbow forward
Position of arm at the middle of stroke must be vertical, elbow and hand on shoulder line, with enough flexion from elbow joint.
http://www.swim.ee/models/_free_swim1.html
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2. ARMS PUSH & RECOVERY PHASE
Freestyle Swimming Stroke
http://www.swim.ee/models/_free_swim1.html
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Requirements for self control:
http://www.swim.ee/models/_free_swim1.html
The pushing action of arms must be with good acceleration, with correct force transfer and wrist cocked
The timing of recovering arm entry must be at the middle of the strokeThe leg kick during push must be impulsive, strong and co-ordinated with arm push impulse
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Requirements for self control:
http://www.swim.ee/models/_free_swim1.html
The exit of arm must begin with elbow first , but not too early, after push is overAvoid hand slip through the water, try to stick it to the water
Make recovery arm relaxed elbow forward before hand
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http://www.swim.ee/models/_free_swim1.html
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How the elite do it!
http://www.youtube.com/watch?v=gIgstGRkTxQ
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Theory: Summation of Forces Prac: Breast stroke / Back Stroke / Freestyle
Looking Forward to Next Lesson: