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When you Bend your Leg your hamstring contracts and your quadriceps relax
you bend the back leg and take your skirt and hold it, and bend your legs
they bend...
Takes practice
If you mean one leg then; Fondue. If you mean both legs then; Plie
You have either hurt your leg badly or broken it.
Mammals have a joint in the middle of the leg that is called a knee. In humans this joint allows the leg to bend backwards.
Your knee allows you to walk and bend your leg.
To bend the leg so you can walk and survive
"It bends when you need it too. If we did not have that then you wouldn't be able to walk."what.
Which leg do you not want to have? Bend that leg back at the knee and keep it folded behind you. Good luck keeping it that way.