He proved his point three years later, when Radboud University researchers brought in two dozen healthy male volunteers and randomly split them into two groups.30 Half the men spent the next ten days learning Hof’s version of Tummo while exposing themselves to cold, doing things like playing soccer shirtless in snow. The control group received no training. The two groups were brought back into the lab. Each was hooked up to monitors, then injected with the E. coli endotoxin. The group trained by Hof were able to control their heart rate, temperature, and immune response, and stimulate the
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