LOL! Yeah, I can relate to that :) I remember distinctly how I felt after my first class when I wasn't used to using those muscle groups--I don't think I've ever been so sore in my life, and the pain lasted like a week :) It's never been quite as painful after that, but taking a break and then getting back into it is always "fun" for the first two or three workouts, LOL! :) What style of Karate are you studying and what are you working on?