3 ab exercises NOT to do unless you want a big waist

One is a waste, one is dangerous, and the other builds a blocky waist! Here are three ab exercises NOT to do:1) The Waste of Time Exercise: Broomstick Twists I can't believe people still do these, but recently a guy did them while standing on a Bosu Ball. What a waste of time, they do nothing for you! 2) The Dangerous Move: Weighted Sit-ups Sit-ups, especially weighted sit-ups, can cause a