They say that athletes make the worse patients. They won't stay off of injuries long enough to let them heal properly.
So for once I'm going to let my head rule my heart. I'm staying off my bad knee today because I know a 2 hour class tonight would kill my efforts to let it heal this week. My two students are too new to go through class with verbal directions. I feel bad that I had to cancel though. Still better to skip one class than to do permanent damage.