Im just guesing, but something like this looks logical for me. The main reason we are build that way is to run and the hamstrings and gluts are the most important muscles for the forward propulsion. This means they both try to pull back and up the leg. In this movement there is no prestreching involved. With the weights we try to hoist something. This means that when we erect the leg our torso will elevate. It´s like
http://creativemusclecars.com/images...od%20hinge.jpg
I don´t know if it was ment for the hamstring to be used under such loads at most stretch position...
I don´t know any machine which simulates something natural...


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. Theres an old saying, train smart, Ive found you have not got to be smart to use Machines. Plus it wont make the Body smart.
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