Hof holds eighteen world records including a world record for longest ice bath.[1] He broke his previous world record by staying immersed in ice for 1 hour, 13 minutes and 48 seconds at Guinness World Records 2008. The night before, he performed the feat on the Today Show.Wikipedia: Wim Hof
Dr. Kenneth Kamler monitored the event to explain the effects of using the Tantric practice Tummo to control one's body temperature. Tummo has been practiced by Yogi monks in Tibet. Wim describes his ability to withstand extreme cold temperatures as being able to turn his own thermostat up by using his brain.
In February 2009 Hof reached the top of Mount Kilimanjaro in his shorts within two days.[2]
In 2007 he attempted, but failed (due to a foot injury), to climb Mount Everest wearing nothing but shorts.[3][4] Hof has been criticized for his stated justifications for this attempt: "Edmund Hillary's ascent of Mount Everest was a testament to human achievement; my climb of Mount Everest in my shorts will be a monument to the frivolous, decadent nature of modern society."[5]
In 2009 Hof completed a full marathon (42.195 kilometres (26.219 mi)), above the polar circle in Finland, in temperatures close to −20 °C (−4 °F). Dressed in nothing but shorts, Hof finished in 5 hours and 25 minutes. The challenge was filmed by Firecrackerfilms, who make productions for BBC, Channel 4 and National Geographic.[6]
Hof again broke the ice endurance record in 2010 by standing fully immersed in ice for 1 hour and 44 minutes in Tokyo, Japan.[7]
In 2011 Hof broke the ice endurance record twice, in Inzell in February and in New York in November. The Guinness World Record is now set for 1 hour and 52 minutes and 42 seconds by Hof.[8] On April 18, Hof got the test results regarding the "The influence of concentration/meditation on autonomic nervous system activity and the innate immune response" case study, demonstrating that he is able to directly influence his own Autonomic Nervous System and Immune System. Hof seems to be able to raise his cortisol levels and lower the amount of cytokines (flammatory bodies) just by using his meditation techniques. A different study on Hof while immersed in ice showed that Hof suppressed the cytokines by 100 percent.[9] In September, Hof also ran a full marathon in the Namib Desert without water. The run was performed under the supervision of Dr. Thijs Eijsvogels.[10]
