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Anthony J. Yeung, C.S.C.S. View post: Using These Unconventional Gym Tools Can Fix Your Balance and Build Functional Power, According to a Movement Expert Jefferson curls strengthen the posterior ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. It’s easy to almost ...