This is one of those questions that comes up every few days. If my connection were faster, I’d even point you to some of the previous threads discussing it. The short answer is that this doesn’t work. Use the “search” button at the right-hand corner of the page to find more detail.
I’ve never done much research on these types of things but I do know that Bruce Lee used something similar. I doubt he would use it for very long if it didn’t work. Do some web searching, I’m sure the answers are out there.
you know, you’d be better off initiating thermogenesis by sitting only in your underwear in a room with the temperature at 60 degrees or lower. This burns body fat only, and was designed to keep the caveman warm when lots of clothing wasn’t available.