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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.

Get moving with this 30-minute session focusing on core work and glutes. Led by PS Fit instructor Natalie White, and assisted by Madisyn Maniff and Sierra Fujita, this fun class is bound to have you ...

Known for her thrilling, energetic performances on "Dancing with the Stars", alumni Lindsay Arnold is no stranger to staying active. Fans of her 30-minute dance circuit workout will love this ...

A strong core means stability, fewer injuries, and better posture and balance during exercise. While you might be familiar with the abdominal exercises that engage the outer abdominal muscles — think ...

Psst: it's not another plank.

And why boxing is so good for women over 50, straight from Geri's coach ...

Pilates trainer Aliyah Hatcher shares the best Pilates core exercises that make it into every single one of the sessions she teaches. Since your core is the guiding force in every move you make—both ...

Add Yahoo as a preferred source to see more of our stories on Google. "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." That's why it pays to dedicate ...

This Is the Best Workout Move for Core Strength, No Crunches Required originally appeared on Parade. Aesthetic reasons aside, having strong and stable abdominal muscles is important for several major ...