L-Sit: The Toughest Body Weight Core Exercise You're Not Doing - Swimming World News

By Dr. G. John Mullen, Swimming World Contributor. We have all heard the core is essential for swimming. Some debate the amount of necessary core work for elite swimming performance.

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[Lauren, Mark, Clark, Joshua] on . *FREE* shipping on qualifying offers. You Are Your Own Gym: The Bible of Bodyweight Exercises

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