I can't even imagine doing Zumba right now, and I think all of you who have kept up some sort of real exercise routine through the first trimester are amazing. You give me something to aspire to!
I've been going on leisurely walks every day - one 15 minute walk at work with a nice break in the middle to take in the sun and the river view (...sometimes I even lay down on a bench by the river), and then one 30 minute walk in the evening. The only time I've felt my heart rate get up to anything that feels remotely athletic is when I have to go up a hill that didn't even look like a hill until I was walking up it. There are a couple actual hills, too. But I take them slowly. Anything more active than that and my blood sugar tanks.
Today I felt like actually exercising for the first time. It started when I had to take a "walk" through my house because it is so hot and muggy outside tonight. I was bored and feeling pretty good, so I picked up my little 3 lb weights and started doing some easy arm stuff as I paced back and forth. Then I started doing some gentle ab stuff. Then I did a few squats. Then some calf lifts, all as I walked. My heart rate went up, my muscles felt like they were working for the first time in months, and it felt SO GOOD. I could feel the endorphins kicking in, which is a feeling I haven't had for a long time, now.
It was kind of a weird exercise session, but I'll take it. It felt good to remember that my body can do things besides feel like crap (and build a baby, yeah, yeah).