I just played Wii and all my joints are killing me, I am not used to be playing Wii everyday but since i am on holidays I kind of feel the urge to. I've been playing Wii sports and Wii fit. Wii sport is all about playing tennis, bowling, baseball ext.... it is fun but it make you so stiff the next day. Wii fit is where they test all your skills into games and they also do yoga and stretches. Even though my joints are really sore and stiff now I know that they will be worse in the morning.