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.

One 2019 study, published in PLoS One, found that an eight-week core training program improved balance and core endurance ...

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

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 ...

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 ...

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 ...

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 ...

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 ...

This workout is short — just 10 minutes — and requires no equipment. But it packs in a lot of work. PS Fit instructor Natalie White designed it to target your abs, core, and thighs, and she'll have ...