Exercise

I started a fitness program for weight loss sponsored by our local newspaper. After 2 months I had increased my 15 minute workout:
pool, stationary bike, and walking my dog 5 minutes each to 1 hour for 20 + minutes each. I had lost 17 pounds, felt good, was energized. Then on the night of March 17th I got out of bed and fell on the floor, unable to use or feel my lower body. My wife helped me get back in bed. She brought me two canes I had to use. In time I let one cane go and eventually I was ambulatory again.
I tried to read about MS exercise limitations but I was unable to find information about how much is too much.
This occurred in 2020. I have not been back to the gym but I have helped coach my Grandson's baseball and football teams the last two years. I have not reached the level of physical strength I had before my collapse but I am still able to do life skills and everyday activities. Any thoughts on limits to exercise?