I exercised during pregnancy with DD, but not more (or less, really) than "usual" and I had some additional complications that meant that I really was restricted.
(Joint laxity takes on a whole new meaning if you are already hypermobile to begin with, let's just say).
I also had to give up anything that appreciably increased BP or heart rate in my third trimester (since I wanted to, um-- have a third trimester, I mean).
I was working 65hr+ weekly, too, which didn't leave a lot of gym time. I had an old-school Cross-country ski machine and that's what I did 6-7 mornings a week. It was pretty high intensity, but I was in VERY good physical condition in those days.
