The Triceps pass exercise works your triceps and abs.
Lying on the floor and holding your partner's ankles, squeeze the ball to keep in place after your partner puts in between your feet. Lower your legs towards the floor. Don't let your lower back arch off the floor when your legs back up and your partner will take the ball and lower the ball behind her head as you bring your legs towards the floor. The next time you bring your feet back up, your partner will place the ball on your feet again, then repeat. Do 20 reps, switch positions and repeat.