HOW: Get set-up laying flat on your back with your knees bent to approx. 90-120 degrees. Bridge up to lift your hips up into the air. While holding this position keeping your hips up as high as you can, lift your toes off the ground and slowly walk your heels out as far as you can to straighten your knees. Return to starting position keeping your hips up in the air and repeat.
FEEL: You will feel the muscles behind your thigh, knee, hip, and butt muscles working hard with this exercise. You may also feel your core and back muscles working too, but do not compensate and use your back too much.
COMPENSATION: Limit excessive arching of your back, keep your hips level with the ground. Do not let your hips drop very fast as you straighten out your legs walking your feet out