Try this partner ab workout to boost motivation and make core training more fun while building strength together ...

Try these two simple moves with a little help from a friend. It starts with one partner doing a plank—but not just any plank. The other buddy places a plate (in this case, a 45-pounder) and puts it on ...

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Jessica Biel has the best workout partner. In an Instagram video posted on Aug. 6, the actor walked her followers through a "killer" Pilates ab routine, with an unexpected visit from her husband, ...

Looking for a quick ab workout to fire up your core? This seven-minute intense ab challenge targets your lower abs with no equipment. To find out for myself, I unrolled my yoga mat and gave it a go ...

If you’re a fan of the popular anime series Attack on Titan, then perhaps you admire character Mikasa Ackerman’s acrobatics and strength. And you’re not alone — Mikasa’s athleticism paved the way for ...

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 ...