I think you can get the preggi bellies vid on ebay...???? My physio has also given me stomach exercises to do but all using very supported (braced) stomach muscles and pelvic floor - i think it is important to do them correctly so perhaps a class or 2 first (or a visit to a physio if you can afford it) to learn what to do and then you can do them on your own. Aqua is def good as you are supported by the water.
It seems v strange that they didnt give you more info or answer your questions.
I thinka fitball is a good investment, I used to have one but got rid of it when i went o'seas, i think i will get another - for sitting on, exercising on and then i heard it helps with early labour pain too... re cat claw proof, they would not burst easily (you can sit onthem after all)...
HTH and good luck!