Source wimhofmethod.com
In January 2016, 29 people with no mountaineering experience led by Wim Hof made their way to the Gilmans Point summit of Mount Kilimanjaro without acclimatisation during a fast ascent.
According to journalist Scott Carney the US Army Research Institute of Environmental Medicine predicted that 65-70% of these amateur mountaineers would get acute mountain sickness (AMS) if they attempted to summit so quickly. That did not happen.
I found this video really interesting as I have been meditating and using some of Wim Hofs breathing techniques for the past few weeks and I have found them to be very effective. For example, I can now go without breathing for more than 3 minutes at a time and can do do 20 push-ups without a breath. It is worth trying out, he does sound a bit crazy, but he is a cool guy.