YOU PROBABLY THINK you know how to do a plank. The ab training staple is relatively simple, after all—boiled down to the basics, all you need to do is get down on the ground and hold in place.

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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. Do you want a strong ...

Abdominal bracing is an exercise motion that you’ve likely encountered and performed, whether you realize it or not. It’s the movement that’s implied when your coach, fitness instructor, or physical ...