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Year Long Workout: Phase VII, Workout B

3B Swiss-Ball Jackknife

Sets: 3 Reps: 8-12 Tempo: 232 Rest: 60 Seconds

Get into pushup position and rest your feet on a Swiss ball [1]. Contract your abs and bend your hips and knees to roll the ball toward you, keeping your back flat [2]. Reverse the motion to return to the starting position. That's one rep.

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