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

Naturally, your go-to core workout might include a variation of sit-ups, crunches, and planks. Because as a runner, you know how important training your midsection is to improve your performance. But ...

This 10-minute morning circuit activates deep core and glutes to help tighten your waist after 50, no gym required.

If getting toned and strong abs are one of your goals this year, it’s important to know a few things before embarking on this journey. Your abs are made up of four parts: the rectus abdominis, ...

(CNN) — If you want a resilient core, strengthening your six-pack is just the start. Your obliques — the muscles that run along the sides of your waist — may not get the same attention as your ...

You probably don’t think much about your core when you’re running—until something starts to hurt. Maybe it’s your back after a long run. Maybe your hips ache every time you increase your mileage. Or ...