After putting it off for far too long, I've finally decided I'm going to bite the bullet and try to correct a few fundamental flaws in my serve. This basically means starting from scratch with a new motion. I've heard somewhere that it takes 30,000 reps of a new stroke to "master" it and fully cement the muscle memory in place so the stroke because natural and you don't have to think about it. Sounds like a lot, but probably about right. Problem is, how do you go about completely changing a shot while you still need to play? It's not like I can take 3 months off to just practice my serve every day. Even if I hit 100 practice serves a day that is only 3,000 a month, so it would take 10 months of hitting 100 every single day to reach 30,000. I've never had arm, elbow or shoulder problems ... is there any benefit to hitting lots more in a shorter period of time to speed up the process? I mean I could hit 500 serves a day (spread out over at least 2 sessions) and my arm would be fine. Is there benefit in doing this? Curious, especially from any coaches out there, what is the "recommended" way to overhaul a stroke while you still need to keep playing matches?? My serve has a few fundamental problems that have kept me at the 4.0 level far too long. I've had enough and I will do anything to fix it.