HOW: Begin lying face down with your legs straight and toes pushing into the ground. Your arms should be up with your forearms and elbows on the ground but relaxed. While keeping your knee straight, lift your leg off of the ground and return when it is as high as you can go without using your low back.
FEEL: You should feel your hamstring and glute muscles working.
COMPENSATION: Don’t bend your knee when lifting your leg up. Don’t use your low back or twist it.