raise my body temperature with my thoughts

Ok im new to 43things.com But i find the idea to be very appealing. enough of that though.

have you ever seen those specials on tv where the monks from india i think take hikes up in the mountains in the middle of the freezing winter with just light robes. then they stay in caves and stuff and put freezing cold wet towels on themselves and in a matter of a minute or so make them steam?

I wonder how they do that. I might not want to id just like to know.