I'm T2. I've always done a moderate amount of exercise, but since diagnosis on 31/12/12 I have upped my exercise so I now do 8 gym classes per week. These include weights, aerobics, cardio combat, HIIT and ketlebells as well as 2 circuit training classes. However, I can only exercise in the evenings due to working full time. So I tend to do 1 or 2 classes each evening, and a couple of classes at the weekend. My husband and kids never see me any more!
Interestingly, my BG sometimes goes up following a class, and sometimes doesn't, but I can't work out a pattern. So I can eat the same meal, then go to the gym, do the same class and on one day my BG will be lower after the class and the next day it will be significantly higher. I did think at first it as the aerobic-type classes that were pushing it up, but then it shot up after some of the weights classes and went down after some of the aerobic ones. Yesterday I did cardio combat, my reading before I went to the class was 7.3 (I had eaten 2 hours before that), when I got back from the class it was 8.5. And yet the week before, with the same meal eaten (yes, I'm that boring!) it was 7.8 before the class and 6.2 after.
If I could identify a pattern and work out if particular classes were causing a rise in BG level, I could swap some of my classes or even - shudder - take up running (although I've yet to find a sports bra that will allow me to run with any degree of comfort!).