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 crunches, sit-ups and oblique twists that give your midsection visible definition — there’s a lesser-known and harder-to-see set of core muscles that deserve just as much attention. They're called the deep core.

Trainer Tip of the Day: Know the Difference Between Your Deep Core and Abs

“Unlike the superficial ab muscles, the top layer of muscles you can see, the deep core muscles are hidden beneath the surface. They act like an internal corset, wrapping around your spine and pelvis to support movement and posture,” Danielle Gray, trainer for the Start TODAY app and founder of Train Like

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