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Butterfly stroke
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Transcript

  • 1. BUTTERFLY STROKE
  • 2. HISTORY
    • 1933 Henry Myers swam a butterfly stroke in competition at the Brooklyn Central YMCA in late 1933 .
    • butterfly style evolved from the breaststroke.
    • In 1934 Armbruster allegedly refined a method to bring the arms forward over the water in a breaststroke. He called this "new" style "butterfly".
  • 3.
    • in 1935, Jack Sieg a swimmer also from the University of Iowa developed a kick technique involving swimming on his side and beating his legs in unison, similar to a fish tail, and then modified the technique afterward to swim it face down. He called this style Dolphin fishtail kick .
    • John Arthur Stephens
    • Dr Philip Mcallister -claimed to have invented the stroke almost 8 years before David Armbruster.
  • 4.
    • 1938, almost every breaststroke swimmer was using this butterfly style, yet this stroke was considered a variant of the breaststroke until 1952
    • The 1956 Summer Olympics were the first Olympic games where the butterfly was swum as a separate competition
  • 5. MOVEMENTS
    • Arm movement-
    • The butterfly stroke has three major parts, the pull, the push, and the recovery.
    • At the beginning the hands sink a little bit down with the palms facing outwards and slightly down at shoulder width, then the hands move out to create a Y .
  • 6.
    • The pull movement follows a semicircle with the elbow higher than the hand and the hand pointing towards the center of the body and downward.
    • Do not form the traditionally taught "keyhole" when using this stroke, as it disrupts the flow and speed of the stroke. The arms should be pushed straight back after the Y is formed.
  • 7. LEG MOVEMENT
    • the leg movement is similar to the leg movement in the front crawl except the legs are synchronized with each other, and it uses a wholly different set of muscles.
    • The shoulders are brought above the surface by a strong up and medium down kick, and back below the surface by a strong down and medium up kick
  • 8. BREATHING
    • there is only a short window for breathing in the butterfly. If this window is missed, swimming becomes very difficult. Optimally, a butterfly swimmer synchronizes the taking of breaths with the undulation of the body to simplify the breathing process; doing this well requires some attention to butterfly stroke technique.
  • 9.
    • Normally, a breath is taken every other stroke. This can be sustained over long distances. Often, breathing every stroke slows the swimmer down.
    • Other intervals of breathing practiced by elite swimmers include the "two up, one down" approach in which the swimmer breathes for two successive strokes and then keeps their head in the water on the next stroke, which is easier on the lungs
  • 10. BODY MOVEMENT
    • Swimming butterfly is difficult if the core is not utilized, and correct timing and body movement makes swimming the butterfly much easier. The body moves in a wave-like fashion, controlled by the core, and as the chest is pressed down, the hips go up, and the posterior breaks the water surface and transfers into a fluid kick.
  • 11.
    • During the push phase the chest goes up and the hips are at their lowest position. In this style, the second pulse in the cycle is stronger than the first pulse, as the second pulse is more in flow with the body movement.
    • Although butterfly is very compatible with diving, the resulting reduction in wave drag does not lead to an overall reduction of drag. In the modern style of the Butterfly stroke one does only little vertical movement of the body.
  • 12. START
    • Butterfly uses the regular start for swimming. After the start a gliding phase follows under water, followed by dolphin kicks swim under water. Swimming under water reduces the drag from breaking the surface and is very economical. Rules allow for 15 m of underwater swimming, before the head must break the surface, and regular swimming begins .
  • 13. TURN AND FINISH
    • both hands must simultaneously touch the wall while the swimmer remains swimming face down. The swimmer touches the wall with both hands while bending the elbows slightly
    • One hand leaves the wall to be moved to the front underwater. At the same time the legs are pulled closer and moved underneath of the body towards the wall.
  • 14.
    • The second hand leaves the wall to be moved to the front over water. It is commonly referred to as an "over/under turn or an "open turn
    • Then the swimmer pushes off the wall, keeping a streamline position with the hands to the front. Similar to the start, the swimmer is allowed to swim 15m underwater before the head must break the surface. Most swimmers dolphin kick after an initial gliding phase.
  • 15. THANK YOU……….
    • MICHAEL MAGNO
    • BSED MAPEH