Quote Originally Posted by Catrin View Post
Ahhhh, I understand now. I know about the plank (prone) and will ask him about the side. You are telling me that I need to focus on holding my stomach muscles in all of the time - yes? Considering I work at a computer I am quite sure that this is related.

Have you ever tried one of those exercise balls to sit on while at the computer? You can get a rolling chair to put an exercise ball into. you have to keep your core muscles engaged while sitting in it, or you'd roll away from the computer!