I'm on day 8. Yesterday was the first time i had true detox hellmania (a new word i invented). I was working on the computer when a wave of nausea and headache came over me. I lay on the couch for 30 mins. staring at the ceiling and then fell asleep for 3 hours. When i woke up i felt like a million bucks and feel pretty darn good today too. Aside from the fact that every morning feels like a mini stomach flu with several trips to the toilet... all is good.
As for exercise, I have been riding my bike every day... but that is really just to get around. I am finding it much harder to pedal as my legs are a bit achy and feel weak. I wouldn't want to do any strenuous exercise on the Master-Cleanse for sure.