Hey guys, I'm a 15 year old boy, and this summer is really busy. I have tons of summer school work and SAT prep from 8 in the morning to 2 in the afternoon, so I can't always get much tennis played. I'm averaging maybe 4-5 hours a week. Anyways, I want to get as good as I can. I have to be ready for school by at least 8 AM. I'm planning on waking up every morning at 7:00 to work out for 30 minutes or so. What do you guys suggest? I know I'm young, so I shouldn't lift weights. Plus, I want to grow more. But I want to lose weight, gain some muscle, and become faster. This is what I'm doing so far: light jogging, ending with some sprints, followed by 300 jumpropes. Then I do pushups and sit ups for a few minutes. And after that, I just stretch until I have to be ready for school. What else can I do to build up my speed, endurance, strength, and lose a bit of this weight/fat? Also, what are some good wrist strengthening exercises? My wrist often hurts until I get warmed up.' Thanks a lot guys!