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

A simple medicine ball can transform basic core exercises into a full-body stability challenge. Trainers say this at-home ...

No offense to sit-ups, planks, and hollow holds, but basic core exercises can feel drab day after day. They work the abdominals, but if you’re looking for stronger, sculpted abs, let me introduce you ...

Pilates has taught us that you don't need to invest in expensive equipment to get a great core workout at home. But one simple tool — the humble Pilates ball — may be worth grabbing anyway. A Pilates ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." No offense to sit-ups, planks, and hollow holds, but basic core exercises can feel drab day after day.

Strength training is an essential part of any running routine, with core exercises being some of the most important. A strong core stabilizes your entire body, helping runners move more efficiently ...

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"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." That's why it pays to dedicate focused training time on your core. You can start with these ab exercises ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Lie on the mat with your arms extended straight up.

Begin to lower the dumbbell behind your head, driving your elbows toward the ceiling. Avoid flaring your elbows—keep your arms tight and close to your torso. Work to get a deep stretch at the ...