We need some pointers for getting this skill, on a consistant basis. My DD can get over occasionally, but most of the time, stalls out right before she goes over, then falls flat on her back or back to a bridge. Is it more about ab strength, flexability, or what. She is fine with just the slightest bit of elevation to start out, but on a flat surface, she just cant seem to get over. She needs to be able to do this skill before the coaches will advance her. Any good exercises or pointer would be appreciated!!!