I'm questioning if I should play tennis for my school team this year. I'm debating between track and tennis, during track I would be running long distance. I just wanted to know what was worse for my knees, tennis or track. This year I ran cross country which kind of hurt my knees, so for this winter I joined the swim team. Now swimming is almost over and I have to decide tennis or track. I did decide to quit tennis when I found out it was bad for your knees but now I want to play again. I just have a strong desire to play. For my school the tennis courts are hard courts. Our track field is a bit cushioned (not sure on the material). So what is worse? Tennis or track. For tennis I believe i'll play mostly doubles this year. Also, whats worse for your knees in the long run? I'm just terrified of even the slightest idea of knee surgery but I still want to do at least one sport.