A quick, equipment-free routine is gaining attention for strengthening the core without ever getting down on the floor.

This move, as the name suggests, combines a three-legged plank (challenging enough on its own) with a tiger curl, which ...

The three-legged plank to tiger curl strengthens your core, hips and shoulders.

McGill curl-ups, or modified curl-ups, are much friendlier for your lower back than moves like sit-ups, as your lower back is ...

Visible abs aren’t built through endless crunches and gym misery – here’s how to get leaner, stronger and more defined by ...

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While ab exercises like the situp and crunch tend to get all the glory, there are plenty of other moves that work the region just as effectively. And there is something to be said for adding variety ...

Hafthor "The Mountain" Björnsson has lost 121lbs and now has shredded abs. Core training is particularly important for him right now as he embarks on a boxing career. Björnsson told Insider he does ...

There are two kinds of people in this world: People who want to work their core and people who consider core exercises their worst nightmare. But regardless of which camp you fall into, if you are ...

Personal trainer Ben Carpenter has a rippling six-pack but can't do a sit-up, he told Insider. Carpenter's ab definition comes down to his low body fat levels which are a result of chronic illness. He ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. It’s kind of strange, ...