[Barcs]

I was referring to the toxins stored in your fat cells that break down when you fast. I don't know exactly which ones, but I'm pretty sure it includes stuff like processed foods and other chemicals that we come in contact with frequently. Apparently, your tongue and lungs excrete toxins as well while you fast. Since less energy is spend on digesting, more is spent on healing and cleansing your body.

When you exercise while fasting, I hear that your body does release toxins faster, so there's a good chance it had to do with both of them. Light exercise on a water fast is ok, but you shouldn't be doing heavy, muscle building type activities or intense running. A simple daily walk should suffice.