Sit-ups are a simple bodyweight exercise. Here's how to perform sit-ups safely, according to experts, and the muscles worked, along with the benefits.

Explore the differences between decline crunches and sit-ups. Find out what muscles each targets, and learn proper form to enhance your core training.

Not bad for $100 or $150 and zero bicycle sit-ups. If you've been wearing the belt to work, you may also have been let go thanks to your constant grimacing. Use your newfound free time to take that ...

You don't need crunches to get a flat stomach. You need full-body workouts that utilize multiple muscles to learn strength, and squat, and define your midsection.