Trainer, author, and fitness model Kirk Charles, NASM-CPT CES, knows
Read moreMen Over 40 Should Use This Plank to Build Stability and Strength

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Trainer, author, and fitness model Kirk Charles, NASM-CPT CES, knows
Read moreThe plank is a standard core training exercise, one that
Read moreThe Fitness Challenge of the Hollywood fitness trainer Jeanette Jenkins
Read moreWhen you’re doing a plank, you’re (hopefully) concentrating on your
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