"So i try to keep my top hand right over my shoulder, like said above, then as soon as i leave the ground and the tip is in the box, my bottom arm comes up and above my head."
I have no problem with anyone sharing their experiences but unfortunately these statements should not be taken on board by anyone else. What is being descrided is a classic late plant. It is very bad advice because it is completely the opposite of what most of the great vaulters of recent times actually do/did.
The hands should in position for take off BEFORE the take off foot hits the ground. This is set up in the previous phase where, when the athlete in still on the right leg but moving on to the left- say half way - , the top hand should be just above the head and the left hand at eye level.
At the instant the tip of the pole hits the box, BOTH hands should be driving up through the pole as a result of the whole body being driven up at take off. The right hand is driven up vertically above the head =and the left hand - being attached to the pole - will also follow that path -but remember that both arms are attached to a body which is moving up and forwards as this happens -so relative to the ground the hands will be moving up and forwards -hence the confusion for untrained observers .The body must be solid from top hand to take off foot aT THIS POINT AND THE RIGHT SIDE MUST BE ESPECIALLY STRONG AS THE TOP ARM RESISTS THE POLE. Sorry about the caps.
However if the left hand is correctly positioned on the pole - the left elbow will be outside the line of the pole so that the left arm is now in a flexed and slightly weak position to resiSt the shock of the hit . So as the chest is driven up 'through' the opening shoulders, the left arm is unable to resist the forces involved and the left hand and arm - steel elastic - will be driven back over the head and the pole is now loaded by the top arm.
The advantge of this dynamic flexing is that now the athlete can swing around the hands and put more energy into the vaulter/pole system.
Check out the film and it is clear - then of course as the body swings to the chord off the pole the centripital forces of that movement continuue to force the pole to flex.
Thats it folks. Take it or leave it.
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Its what you learn after you know it all that counts. John Wooden