Trainer Luke Jones shares a six-minute ab workout that activates deep core muscles, improves posture, and leaves you feeling the burn long after you're done.

So, in the name of curiosity (and core strength), I decided to try a workout created by Justin Gelband — a world-class ...

Finally, far from focusing on a flat stomach, your deep core muscles work your pelvic floor and diaphragm. Your pelvic floor muscles are a group of muscles at the base of your pelvis, and ...