Hi there, I'm new to this - mumsnet and pregnancy - and due in May 2007. At just 13 weeks I finally feel able to get off the sofa in order to attempt something more strenuous than turning on the kettle. But what? I'm usually quite active but at the minute feel quite unfit. Can someone reccommend a good form of exercise that will not only help pregnancy and birth but is also aerobic? I know it's unlikely I'll be swimming the channel but any suggestions most appreciated. I live in N16, London so if anyone has any specifics please tell me. Thanks.