It's also advisable to read The Master Cleanser book by Stanley Burroughs. Some of your questions are answered in the book.
I've continued to work out during the cleanse. I have had to go a little easier on myself than I usually do, but I didn't want to stop altogether. I've done swimming, elliptical machine, and weights. Just pay attention to what your body is telling you, and rest when you need it because that is part of the healing process, too.