Knee push up

Starting Position:
Lie on your stomach on a mat. Place your hands, palms down, on the mat at the level of your shoulders.Pushing with your arms, lift your trunk and thighs off the surface of the mat until your elbows are straight. Your knees should be bent, and your lower legs and feet should be on the mat. Keep your back straight and do not let your stomach sag.
Action:
Slowly bend your elbows, lowering your trunk and thighs toward the surface of the mat. Push away from the mat again, straightening your arms. Do Not Cause Pain.