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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 [1]. Contract your abs and bring your knees to your chest, rolling the ball toward you [2]. Reverse the motion to return to the starting position. That's one rep.

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