To clarify on Wim Hof, he does NOT actually have Hypothyroidism. Wim Hof uses breathing techniques and years of cold exposure to do the things that he does. He's able to consciously tap into his autonomous nervous system (https://www.wimhofmethod.com/science), allowing him to control his body's reaction to extreme cold. This has nothing to do with a disease but is something that can be learned and taught to others.