A few weeks ago, I started doing antenatal aerobics classes at the hospital and really loved the first couple. However after the most recent class I found that I began to get terrible pains in my lower legs the night after class. Now I seem to get these pains no matter what I do. I don't know whether to keep attending the classes or not as I want to maintain my aerobic fitness, yet don't want to worsen these pains (which I guess are to do with circulation). I wear proper cross trainer shoes to class and the class is moderately low impact. However, I don't think that the floor is a proper sprung aerobics floor – just concrete covered with spongy carpet. Do you have any advice for me?