One Newton, Iowa, man liked doing sit-ups so much, he decided to break a world record. In 1985, Kenny Kirk, 24, did 31,111 sit-ups in just over 21 hours, beating the old record by more than 1,000. His ...

The classic sit-up is a workout staple. Whether you've become all too familiar with the movement in your weekend HIIT class or eked out those last few reps while following a home workout video, you've ...

Hafthor "The Mountain" Björnsson has lost 121lbs and now has shredded abs. Core training is particularly important for him right now as he embarks on a boxing career. Björnsson told Insider he does ...

When most people think of a strong core or achieving abs, the first exercise that comes to mind is often sit-ups. While sit-ups have long been a go-to for strengthening the core, they're not always ...