I'm also sore because a friend goaded me into signing up for the online Biggest Loser Boot Camp that started last Monday. I was actually doing really well with the exercise for most of the week - sore, but it was muscular, not my arthritic hip - then last night my hip and knee decided to make up for lost time and both went out on me on the same move. I slept in our lazyboy to keep from twisting the joints in our sleep. My hip seems fine this morning, but my stupid knee is stiff. I'm going to get on the elliptical tonight instead of their workout since tomorrow's is a lower body strength regimen. That was the one that left me so sore last week, but I fully believe that it was responsible for helping my hip. Strengthening the muscles is a definite bonus.
Oh, and I managed to lose four pounds even with going out to dinner and having drinks on Saturday night. Not too shabby.