about two days a month (during the warm months) I go for a 12 mi. hike on a local beach, and I spend the day there just basically sweating and drinking lots of water and eat fruit only for the whole day. I always feel energized for days afterwards...and a little muscle soreness. I think for some people, it can really rejuvenate your body and your mind. But I wouldn't do that for more than one day at a time.