A 7-year-old named Severin with a heart condition tried the Wim Hof breathing method. His heart rate during the exercise jumped from 101 bpm to 166 bpm over a year of practice, shocking the cardiologists who examined him.
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One day we were invited into STRAU. We did the breathing together and we did very basic tests with oximeter on his finger. Severin was running and his heart rate when he was running was going only up to 80 beats per minute, which is understandable with his condition. When he lay down and did his breathing, the heart rate went up to 101 beats per minute. And I was like, wow, you know, I've got goosebumps by telling you this. I strive to practice the method all the time with Severin, and now it's a year past, and the great news is that Severin's heart rate can go up to 166 beats per minute. I spoke to several cardiologists and they said it's very, very unlikely. It's not— they don't understand why his heart rate goes up to 166 beats per minute.