Why are there so many injuries? Some believe there are too many one-sport athletes these days, so they use the same muscles over and over again. They either wear them out or they do not keep their other muscles as strong and flexible as the one they use all the time.Another theory is that young athletes do not work during the off-season if they only play one sport. All school work is done on computers and very few kids have physical jobs or physical chores to do like the farm work of old. Another idea is that they play too many video games which, again, they can do sitting around. A final thought is that they bulk up too much and become inflexible.I believe all of these are a cause of the excessive injuries we see. Plus, I believe that the diets of young athletes are not balanced, and this can lead to undeveloped parts of their body.