Not challenging enough? Hold a weight with both hands. I did 50 stand-up sit-ups every day for a week — here are my results The results are in. Here’s what I learned from doing 50 reps of this ...

How Many Sit-Ups You Should Do in a Day Here, MH breaks down the benefits of sit-ups, the muscles worked, how to do them, how many reps and sets you should be aiming for, the best sit-up ...