I did a Denise Austin pregnancy workout w/both my pregnancies - it was easy in the 2nd trimester, but in the 3rd I was working up a sweat. It's worth checking out. Wonder if you could use light weights (2-5lbs) with an upright bench? Maybe you could do squats if you had a bar to hold on to??? I also used a treadmill on the lowest setting (I mean really sloooow) I was afraid of falling if I went too fast. Also, one more thing that I'm sure you've already heard of. Water aerobics. In my community there is a place that teaches pregnancy water aerobics and they use light water weights. I have not gone to that, but if I became pregnant again it would be something I would check out. Good Luck!!