HOW: Begin face up, while keeping your knees bent to about 90 degrees drive your heels into the floor. Nothing should be moving, hold this position as long as prescribed.
FEEL: You may feel like the hips will be coming off the floor. The exercise should be working the muscles in the back of the leg, specifically the hamstring muscles.
COMPENSATION: Avoid arching at the low back when you dig your heel into the floor
