I play 3-5 times a week for about 2 hours a day and I play with decent power. Nothing mind blowing, but pretty powerful. I also play with monster spin, I know this because sometimes I have problems with getting the ball deep in the court, sort of like Nadal. I saw a video of a guy breaking a string on youtube and he barely even seemed to frigging swing fast at all. It seems like my game should lead to much more string breaking than with guys like that. Obviously this is a good thing, but I feel like a wimp, especially at 18 years old.