HOW: Loop a strap around your working foot and lay flat on the ground. Pull your heel towards your bottom to improve knee flexion until you hit a comfortable level of resistance. . Hold this position for a few seconds before returning to your starting position.
FEEL: You may feel stretching of the soft tissue across the front of your knee. You may feel the hamstrings/back of the thigh working but this should be minimal as the arms and strap are assisting with the movement.