When I did The Master Cleanse I found I could continue to exercise. You have to listen to your body and respond accordingly. On my first long cleanse in 1995, I continued to do my daily walking, plus I was packing to move and looking after my three daughters who were 3,5 and 7 at the time. My dh was working out of town. I had tons of energy and felt wonderful. I drank 6 glasses of the mixture a day plus the lax tea of course. The one thing with doing The Master Cleanse is that the maple syrup still feeds your body so that you still have the energy to do things. Its a little tough when your body goes into some major detoxing and on those days you just have to lay low and let your body heal. But in my experience moderate exercise is always a good thing, just listen to your body and act accordingly. I hope this helps, sorry for getting long winded.