According to a PGA Pro instuctor I have spoken with, he says the Momentus Trainer is not to be used like a regular club, but to be moved through the swing range s-l-o-w-l-y so that the golf muscles are excercised. The trainer was purchased from the inventor and their sales pitch is to swing the thing like a weighted bat. This can and will lead to injury as it is quite heavy. For what it's worth.