For the past weeks, I've been playing tennis everyday from 5-8/9 PM. I don't know if I've been overtraining, but I've been feeling many new uhhh sores? idk how to explain it. But I currently have: a sore left wrist, left knee, and just today, I rolled my left ankle. My left quads have been in pain if there is any rapid movement/stretch. My quads feel tight and it feels like the pain is deep (I ice my legs for a bit, but it doesn't really feel like the cold is reaching the pain area). I also have back pains right now (possibly from serving?). But, I read in magazines that many juniors are training at least 4 hours a day! Even a few of them that live around the area play for a bit longer (and I don't see them wear braces).... If it is overtraining, what do I do? Ice my joints? Braces? I have an ice/heat pack. What do I do to prevent more injuries? A few background information: I'm 16 years old, around 5'8" and around 135 lbs. I've been playing for 2.5 years, always on hardcourt.