Hi; I didn`t have chance to go play tennis on tennis court with other people everyday. I could do this just 2-3 days a week. But i didn`t want to stop training and i decided to play tennis with wall. Only the wall in my house was a garage door and that garage door had glasses on(which wasn`t appropriate to play with real tennis ball). And i saw soft Gamma Revolution balls(http://126.96.36.199/product/image/additional/which_foam_ball3.jpg) on store and i bought them. I play 1 hour with this ball everyday. I am 19 years old. I have been playing tennis for 2 years. I want to know if this ball has benefits(or harms) for me? If so what are they? Help me about that please. Thank you.