I don’t know why I waited so long to try Mom in Balance, a fitness class for pregnant and postpartum women. I was probably put off by the word “mom’ in the name. (Since I am not yet a mom.)  But if that’s holding you back, try to get over it. I’m glad I did. Mom in Balance is an outdoor bootcamp company that offers classes in parks around New York including Fort Greene Park, Battery Park, Prospect Park and…