I am doing STS with alternating days of cardio and even though I don't feel like I am working any harder than before (when I was doing tons of Cathe weight lifting dvds and my regular cardio), I must be! Last night I went to bed at 8 and slept until 6:15 this morning. That is NOT like me!!! Interestingly, all of my muscles feel healed and not at all sore (they were sore yesterday). Guess the ol' bod's trying to tell me something!