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

Your lower back should also remain on the floor. Then, lower yourself back to the starting position to complete one full sit up and continue until you need to stop and rest. New York-based ...

Years ago we did a lot of exercises where we crunched and came all the way up and did a full sit up. And the problem with that exercise is that you're using a lot of other muscles. You're using ...