Smash, they do or have, been there myself. But I bet they havent got a clue how to benifit from it. Its in its infancy how it works at 3,000 metres or above. The russians are the leaders in the field, theres some good work being done at the moment called Intermitant Hypoxie Treatment, theres theories but not many facts. It helps you release Nitric oxide quicker by capillery attraction is one theyre looking at one of my mates is doing a study at the moment, I will find the results interesting.