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Year Long Workout: Phase X, Workout A

3B Swiss-Ball Jackknife

Sets: 2-3 Reps: 10 Tempo: 232 Rest: 60 Seconds

Get into pushup position, resting your feet on a Swiss ball [1]. Contract your abs and roll the ball toward your arms until your knees nearly touch your chest [2]. Reverse the motion until you are back in pushup position [3]. That's one rep.

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