Depends on how long you have been fasting and what activities you have done and currently do during fasting.
-Some people have built themselves to walk during fasting.-Some people have acclimated to hot temperatures and workout therein.
So it depends on what you have done in past and are currently doing in a fasted or dry fasted state.
I completed a 3 day fast and did 2 different hot yoga sessions during those 3 days (60 minutes each). One 60 minutes class on day one and the other on day 3. I also lifted weights on day 2.
I had no problems, drink lots of water- you will be fine. It is a mental struggle, but my body adapted and did great.