I bought this for my husband who has Parkinson’s disease to try out. I have been recording a short video each time he uses it. Over the course of 8 days the improvement has been considerable. At first he couldn’t hit the ball with his right hand and he tired after about two minutes. Now he can use alternate fists and on day six today he worked the ball for 6 minutes. I am impressed and eventually he will begin moving around and hitting the ball. It is a challenge and fun as well.