I also experience mild symptoms of POIS after exercise, difficulty concentrating, brain fog and a little dizzy. I always preferred to do any exercise at night and then take a shower and sleep, because studying or working after practicing physical exercises really doesn't work.
They say it is good to practice sport in the morning kkkk and I believe it is, but for me doing this is the same as missing the day ....
Today I am sedentary, I couldn't reconcile physical exercises with the math faculty, because I couldn't think straight, but I want to practice again soon, I just don't know if it will be possible ...