If You’re Not Training Your Core Like This, You Might Be Missing Out on Serious Strength Gains

Psst: it's not another plank.
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Jumping Jacks Aren't Just for Gym Class. Here's Why You Should Add Them to Your Workouts.

YOU MIGHT THINK back to your childhood gym class and remember learning the basics of physical fitness, setting a foundation for the grown-up workouts you continue to do today. While you likely keep ...