Add Yahoo as a preferred source to see more of our stories on Google. Credit: Shutterstock If you're unsure how to do a sit-up, we've got the answers to help you maximize this popular exercise. When ...

A 60-second self-test scores your core endurance against your age group.

Bear Grylls is no stranger to doing things the hard way, and apparently that extends to his core training. The 52-year-old adventurer recently shared a simple sit-up tweak he uses to increase the ...

From here, lower your torso backwards, reaching your arms behind your head. Bend your back and let your abs stretch and open, ...

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 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 ...