Being sore can result from a couple of different things. One might be that you didn't stretch out enough before and/or after cardio. But, if what you're doing is Pilates, then the likely cause is that you fatigued your muscles more than they're used to. That's actually a good thing, because that is what strengthens them. It's good to rest a day to let your muscles recover, but it's also a good thing to work through the soreness. I started a new workout last week and it made me so sore I could hardly moved. I skipped a day, then did it again. I was just as sore the next time. I skipped a day, then did it again. The next day, I wasn't sore at all, and when I did the workout this morning, it was not only a little easier, but I can tell that I'm not going to be sore this time, which means my muscles are becoming stronger and more conditioned.

Kind of a long-winded answer :blush:, but I hope it helps.

Lori