Hey Chodes- I was told to stay away from them by the Doctor and the Personal Trainer at my Gym. Basically stay away from anything that might make your stomach squish if that makes sense? LOL. And to keep your heart-rate below "something, which I have forgotten" I am no expert though, and I know what you mean about the Gym People not being experts, but then again, I know plenty of Doctors that are pretty useless too, so I say just be careful with everything you do, and then you know you tried your best. I can't wait to see your Birth announcement