I detox 2 or 3 times each year for 7-14 days at a time. I'm actually on day two of my summer/fall transition detox. But I don't exist just on juice. I've been detoxing for the past five or six years and they are a type of ritual for me and I feel renewed when I'm finished (but typically very tired in the process).

I use an OTC detox product along with a diet of lean protein and low glycemic carbs (in other words, white meats and lots of veggies). I miss the fruits/sugars the most! I also cut out all alcohol and caffeine. And I increase my water intake about 20-fold.

But, during a detox, I can't sustain long bouts of exercise. I try to be active each day and run or ride and lift weights, but I can't do anything longer than about 90 minutes.

There are lots of good books on detox diets -- just search amazon.com.