In 2014, Hof took a group of 26 random people, aged 29 to 65, up Mount Kilimanjaro. Many in the group suffered from asthma, rheumatism, Crohn’s, and other autoimmune dysfunctions. He taught them his version of Tummo breathing, exposed them to periodic bouts of extreme cold, then hiked 19,300 feet to the top of Africa’s tallest mountain. Oxygen levels at the top are half of what they are at sea level. The success rate of experienced climbers is about 50 percent. Twenty-four of Hof’s students, including those with autoimmune disorders, made it to the summit in 48 hours. Half the group ascended
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