Yearlong Workout: Phase I, Workout C
1B Swiss-Ball Jackknife
Reps: 10-12 (each leg) Tempo: 321 Rest: 60 Seconds
Get into pushup position, resting the tops of your feet on a Swiss ball . Contract your abs and bring your knees to your chest, rolling the ball toward you . Reverse the motion to return to the starting position. That's one rep.