Heres a Little number . Fit Balls again, Get 2 its one way . Get two against the wall with alittle bit of air out Fist both in the centres in a Boxing stance. Start punching the Balls, but dont lose contact with them, youre going as fast as you can with control. Moving the 3 to 4 inch it needs, you will tire qiuckly . when you have done that turn round and put your elbows against the Balls and use them against the Balls for short ressistance it works.