Exercise Instructions:

  • Lie back on a Swiss ball with knees bent at a 90-degree angle and feet on the floor about shoulder-width apart.
  • Interlace your fingers behind your head. The ball should be under your hips and lower back.
  • Crunch your torso toward your knees, raising your chest upward.
  • Stop when the middle of your back loses contact with the ball.
  • Pause, then return to starting position.