I have found Pilates fantastic for stomach and pelvic floor strength. In fact, because of the Pilates, damage to part of my pelvic floor from when I had ds was not obvious as the "other" pelvic floor muscles are so strong, I have had none of the "normal" problems. I have also had a private session with my Pilates instrucutor, which has changed my position slightly to "engage" my front pelvic floor muscles more easily.
A good Pilates instructor really knows all the muscles groupls and will work very carefully to balance/not over train/strtch/strengthen them all conrrectly. My instructor, Louise Stearn, seems to have trained most of the physios in central Scotland at some point. I know she worked with the physios at the Queen Mums, and the physio who ran the post natal exercise classes also went to one of Louise's classes, and used to incorporate various bits of Pilates into her own classes. The physio I am currently seeing at the Southern General has also had some in-service training with her.
It is important to start with a good, accreditted instructor. The BodyControl Pilates instructors have to go thorugh a rigourous training and examination process.
I would actually recommend having a private session before starting to use a video, although if that is not possble, I ould use one of the Body Control videos.
I started Pilates at about the time of getting pregnant with ds. (Louise only let me continue because I showed enough awareness of my body and all I had to really learn was the breathing techniques.) my stomach muscles had never been strong, so it made my day later inthe pregnancy when the GP said that he had difficulty examining my stomach as the muscles were so strong.
It also helped teach me breathing and later in the pregnancy, when there were certain exercises I couldn't do, Louise had me practising RELEASING my muscles, as well as pulling them up.
You can tell I'm a convert! But I can't emphasise enough how important a good instructor is, at least to get you started and to be sure that you are using the right technique. Ask some of your physios at your hospital if there is anyone in Ayrshire they would recommend.