A simple tweak to your curl form—plus the instability of a fitness ball—can seriously elevate your biceps routine.

You deserve a better ab workout than crunches. Strength training can help you build an athletic core. Equipment like a slam ball or medicine balls provides a more dynamic workout for gains. Stability ...

A simple medicine ball can transform basic core exercises into a full-body stability challenge. Trainers say this at-home ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." Our core is the cradle of our body’s movement—it’s simply impossible to ride at our best and happiest ...

Core training has always been part of military PT and fitness testing. From crunches to sit-ups, flutter kicks, leg tucks and plank poses, the U.S. military uses many exercises to test core strength.

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