I sustained my first karate injury... bursitis in my right knee. I learned Heian Godan a week and a half ago and the jump did quite a job on my knee. There was no pain during class, but I could tell something was up as soon as class was over. The next day I could barely bend my knee, the pressure was so great. The swelling and pressure went down a lot, but I can't do any sort of stance without a lot of pressure and discomfort, and certain movements cause me pain. The doc told me to stop doing kicks and anything that could twist my knee for a few weeks and avoid jumps for the foreseeable future. My sensei agrees of course, and also hooked me up with a cold therapy machine to use on my knee. I won't be back in class until I can do a front stance without discomfort. I'm hoping I'll be able to do that by Friday, but I still won't be kicking for a bit. For those of you who had injuries that took you away from the dojo, how did you keep yourself from going nuts?