Over exercising?

My right knee is achy. I'm not sure if it's from last night's yoga (a lot of hamstring stretching, where I stretched so hard that my toes were tingly), or the culmination of a week and a half of walking, biking, dancing, yardwork, and a workout video thrown in for good measure.

I've been active, and that's good. Also I've kept my calories down, so the weight battle is going well. I just have to baby that knee for a while and take some Tylenol.

So I did a 5 minute walk on lunch today, and plan 10 min of dance practice tonight. I'm keeping moving, but not enough to aggravate anything.