Effect of changing the position of legs when swinging

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Changing leg position while swinging affects the torque and tension in the swing's chains, influencing the swing's height and momentum. Leaning and adjusting leg placement can create a horizontal tension component, propelling the swing forward. Standing on the swing allows for faster height increases by shifting the center of mass during the swing's motion. This technique is exemplified by gymnast Val Dero, who achieves significant height with minimal swings through precise movements. Understanding these mechanics can enhance performance in swinging activities.
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hey,
am writing an extended essay on the effect of changing the position of legs when swinging.
does anyone have a clue about the details?
anyone have a site that can help me?
pls help me
thanks
 
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Initially a person in a swing generates a torque force on the supporting chains by leaning and pulling or pushing on the supporing chains. This results in the chain becoming offset from under the supporting bar, with a resulting horizontal component of tension that propels the person and swing forwards. This can be repeated to further increase the height of the swing. At some point, if the person stands on the swing, the rate of increase in swing height can be made faster by moving the center of mass inwards (upwards) during the bottom portion of the swing, then outwards at the ends of the swing. An example of the latter method is how this gymnast (Val Dero) reaches bar level after just 3 swings after an initial push, followed by a quadruple back flip.

http://rcgldr.net/real/quad.wmv
 

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