I've enjoyed playing tennis for the past 12 months and I can safely say I am far more mature in the sport than other one year players. I'm not the best player around but my understanding for the game is outstanding. However, I literally know nothing about fitness. Other than the thirty minutes of conditioning I get out of my drill, I do nothing outside of tennis. I really want to change this. The past two days I have been running and lifting. Today I ran six miles, did some arm work, some wrist work, went out to the courts and played mini tennis with a medicine ball for about thirty minutes. What should I do to get in better physical condition for tennis? I'd like every workout, since I'm a pretty strong athelete and probably capable of everything. Aside from running, which I'll do every day, what excercises should I do, what muscles should I work? Really, I want to focus on my core, my wrist, and shoulders right now since I am pretty confident in my leg strength but anything I can do I would like to know about.