Posted by: xv84 (xvue84@yahoo.com) on Tue Nov 27 21:37:57 2007

> >>> So what do you need to do to keep the hands and shoulders back to wind the rubber band while the front leg and hips open so you can have a swing that is quick and adjustable and starts "early" with hands still back ? <<<
>
> Hi Tom
>
> I have never agreed with the “X Factor” theory because it equates muscle tissue with the elastic properties of a rubber band. How would you reply to Daw’s post on this topic. --
> <a href="http://www.batspeed.com/messageboard/104082.html">Re: Clips - hip & shoulder rotation</a --
>
>
> Jack Mankin

All materials on Earth are elastic in some way. X Factor stretch creates a passive force on the muscles involved and they react to the stretch. The brain doesn't have to actively tell the muscles to contract.

http://moon.ouhsc.edu/dthompso/namics/pasfor.htm