I didn't find work difficult at all, but I have a desk job. It does require a good deal of thinking and working out codes and problems sometimes, and I had no trouble concentrating on that. As for exercise, I loved long walks (they were so invigorating), and weights at the gym...no problem.
I lost 25 lbs in 15 days on the cleanse - no BP shakes or anything - just the regular master cleanse. I've kept it all off so far, plus a few extra - it's been almost 2 months now. I'm eating raw, and supposedly you lose a lot of weight when you go raw, but I've only lost a pound or two - I'm sure my body is still adjusting to losing 25 lbs in 15 days.