
With your core and glutes contracted, roll the ball towards and away from your body by bending your knees. Complete three-four sets of 10-15 reps for each movement (three movements per set = 30-45 reps total).
The sixth piece of Jen Hudak and the US Freeskiing Team's work out is actually three move in one. The Swiss ball trifecta strengthens your lower body, core, and hamstrings, which all help to prevent ACL injuries
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