A Answers (1)
National Academy of Sports Medicine answeredLie on your back with your knees bent, feet placed flat on the floor, shoulder-width apart. Place your arms across your chest, draw-in your navel and tuck in your chin. Slowly lift your shoulder blades off the ground by rolling your rib cage to the top of your pelvis while rotating your chest towards one knee. Lower your upper body back down to the floor, rotating back to the starting position. Repeat the crunch with rotation in the opposite direction.