*lie on ball with your legs apart and knees bent at 90 degrees
*the ball should be under your lower back and touching your glutes
*crunch up as high as you can without moving the ball, dipping your glutes down or moving your legs
*breathe out when crunching up
*do 15-25 reps
*you should not feel like you are going to fall back off the ball when lowering your upper body back down onto the ball
*keep a steady pace without bouncing.