My dd has a really hard time keeping her feet together when she does her bhs. I've had her do them with something between her feet, never really helped that much. Today I told her to imagine she had money between her feet and if it was still there she could keep it. Then in my infinite wisdom I said, "better yet, let's put a $5 bill there and if you do it you can keep it". Now I wasn't sure if she could do it or not - but sure enough - first try. Just goes to show what they can do with the right motivation. Of course now I'm out five bucks!!