After sustaining an injury to his pelvis and groin during a training exercise, Fire Captain Sean Smiley was diagnosed with hypogonadism. He tried injectable testosterone, but found that the side effects far outweighed the benefits. However, all was not lost. After accidentally discovering that exercise after cold exposure increases testosterone levels, Sean found that his testosterone levels went from the low 200s all the way up to the 700s, all because he was getting into his cold pool before going to Judo classes. In this episode, Sean and Thomas Seager, PhD discus the science of cold plunge therapy, as well as what it means to be healthy in the modern world.