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.

This article is part of CNN Underscored’s The Reset, an editorial package featuring all our articles aimed at giving you the information and product recommendations to help achieve any and all New ...

Runners often forget about the power of the core for performance. This group of muscles—which spans from below your chest through your hips, taking up your entire torso—helps you transfer power ...

A simple yet powerful movement widely recommended by U.S. trainers to target the lower abs, improve core stability, and ...

A simple yet powerful movement trusted by U.S. fitness experts to boost core strength, stability, and athletic performance.

Join celebrity trainer and wellness coach Jenna Willis for a 10-minute strength and core workout with class members Paris Nicole and Taylor Ashlynn. You'll start with a quick warmup to wake up your ...

Ready to ditch endless crunches and finally build a rock-solid core? Your core is a powerhouse encompassing all the muscles from your pelvis to your ribcage – abdominals, obliques, lower back, pelvic ...

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 ...

In TODAY.com's Expert Tip of the Day, a trainer reveals her favorite exercise for a more defined waistline and strong core ...

The core training alone isn't enough to reveal abs. Surprised? Let us help you understand why this happens and what's really effective when it comes to sculpting your abs. Ways to Make Your Abs Pop If ...