My right knee has been sore for the past couple weeks. Sitting in seiza is sometimes painful, and so is walking up stairs (I was at a Phillies' game yesterday, and cursed the four flights of stairs I had to climb to reach my seat). I've been going easy with the stretching exercises during class - though oddly enough, the knee doesn't feel that bad while doing techniques.
I don't recall pulling anything in my knee, or doing anything else out of the ordinary. So what is causing the soreness, and what can I do to make it go away? I certainly don't want to make it any worse.