Sit-ups

How many sit-ups should a man do a day?Will doing 100 sit-ups a day do anything?How many sit-ups can the average man do?Will 30 sit-ups a day do anyth...

Are squats better than sit-ups?What happens if you do 100 sit-ups a day?Why you shouldn't do sit-ups?Will 50 sit-ups a day do anything?Do sit-ups give...