A strong core improves posture and stability. Try this bodyweight plank routine at home. It only takes five minutes.

Here are the four exercises to try.

Exercises like planks, sit-ups, crunches, and Russian twists all serve a purpose: they hit various muscles to build a ...

If you’re a little hazy on the difference between sit-ups vs. crunches, you’re not alone. They both strengthen your core, but the details on how they differ and the benefits of each can be confusing. ...

Core muscles wrap around the midsection like a girdle, forming a connecting link between the upper and lower body. They support, stabilize, and help move your spine, trunk, and pelvis, and most body ...

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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. It’s kind of strange, ...

Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II. We've moved on to bent-knee sit-ups, to crunches and now to the plank pose or hanging ...