And let me introduce you to the work of Lar Hamilton [laughter] and Gabby Ree who are really the first people who for me put this into the language and context of performance that they be for whatever reason Leer got on to Wimhof and recognized that if he trained for these to be able to handle this very dynamic work on a breathold that he could get more work done, get held down longer, pop back up, recover faster, and he saw it as a competitive advantage.