Bunny hop anyone? New data shows that hopping, jumping off and on a 15 inch box at least 10 times a day helps women and I am sure men significantly increase their hipbone density after just four months. In the study done on women between 25-50 the gains were even greater in women who hopped 20 times daily. Here comes Peter Cotton Tail hopping down the bunny trail . . . or should I say Patty Cotton Tail?