I've just started taking Pilates regularly at my gym. I'm doing quite of bit of off-ice training, so it's hard to know what helps and what doesn't. But, I really enjoy Pilates. I feel that I have enough strength that I can challenge myself with the exercises and have them continue to help me. If you don't have some strength to begin with, you may have trouble holding the forms, as other have said, and it becomes counterproductive. I don't get sore from Pilates, but I'm also in pretty good shape. As an aside, if you get sore a day or two after you work out, it means you did too much too soon.