Sitting in a barrel chest-high in ice cubes seems more like torture than a birthday treat. But not for Wim Hof. His techniques, combining hypoxic breathing with ice baths and cold showers, have been adopted by a cult following. Scientists are studying his almost superhuman ability to eliminate fear and control his immune response. Now, a lot of regular people are taking his advice. Amanda Henry, a mother and sixth-grade teacher ... says the stress of distance learning pushed her into 5 a.m. cold showers and Wim Hof breathing. She says the practice helps her to keep her patience. For years, the Iceman, as Mr. Hof is called, gained publicityand some ridicule"for daredevil feats such as sitting for hours on bare ice. In 2013, researchers ... found that 12 people trained by Mr. Hof and then injected with E. coli had milder flulike symptoms than an untrained control group. In 2019, tests indicated a significant decrease in inflammation in 13 people suffering spinal arthritis over eight weeks of training in breathing, meditation and cold exposure. Mr. Hof's career was born out of tragedy. He was in the Pyrenees working as a mountain guide when his wife died by suicide in 1995. "That's the way it actually began"the real trial of my life," he says. "We were left behind with broken hearts, four kids and no money." Swimming in icy cold water had for years been a pastime. Now, he found it stopped the rumination and pain. Cold water causes you to be in the moment, he says. "Going into the cold brought ... stillness in my mind."