Hi,
I'm on Gliclazide which pushes up your insulin so can cause hypos, unlike metformin, not sure about the other one you're on. I do rugby training twice a week and I've found that my bg usually goes up. What I've found is that hi intensity training puts my bg up and low intensity, e.g. general gym work/weights, lowers it.
It's wise to monitor what happens to yourself before and after a training session. I generally eat 2 hours before training which is a long enough gap for the food to fours work and let you train in comfort. I've always got glucotabs with me, just in case. Only had a few hypos but never had a problem during training, low or hi intensity.
You have to see what works for you and see how your body responds. Take it gently and work up to where you want to be.
Cub