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 ...

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

A strong core is about more than just six-pack bragging rights — it’s the foundation of your strength and overall well-being. But you don't need to torture yourself with endless crunches. Instead, ...

Strength training with your running buddy is a great way to keep both of you accountable. It enables you to develop a cross-training habit and supports you in the effort to run injury-free all season ...

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, ...

Build a strong core without lying on the floor using this trainer-approved three-move abs workout for beginners.

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 ...

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 ...