HOW: Anchor a band at or above head height. Grabbing onto the band, pull it towards you as you assume a face-up lying position on the floor. Anchor the band around your ankle. While keeping that leg straight, use the other leg to help push the resisted side towards the floor. Once you have found the desired position and angle, hold.
FEEL: You will feel the hamstring or back of the thigh working.
COMPENSATION: Avoid letting your leg swing side to side. Avoid bending the knee.