Not liquid nitrogen, but nitrogen cooled air, down to -200f.
Here's what I got from the Forbes article:
http://www.forbes.com/sites/brucelee.../#98da6141334e
Basically, it appears to be the current fad used by celebrities and athletes. Name dropper moment: Kobe, LeBron, Demi, Jennifer A. etc. etc... No scientific value but it makes you feel good by releasing endorphins, done by shocking your system. Not to mention the recent death of a 24yr old lady in a Las Vegas spa Oct last year.
I'm calling Bullshit on this one.
Originally Posted by H.Hardhat