My daughter has been working on her yurchenko for a while. According to her coach, her timer/approach is fine, however, she is having trouble with the back part of the vault. Her coach tells her that as she flips off the table she is tucking her knees up and bring her shoulders down (kind of a hunch) and thus loses her momentum. She knows that she needs to continue the backward motion and rotate her hips to tuck but her body will not cooperate! Her coach is simply repeating the direction over and over with no hints on how to correct it. He has decided that she must not be trying. She is but just can't get it. Both of them are frustrated. Her back tuck on the floor etc is fine -- nice body position etc. Any suggestions of drills, strategies or hints?