The day Phil Mackenzie decided to expose his almost naked body to gas colder than the lowest natural temperature ever recorded on Earth started like any other day. The professional rugby player woke up and headed to the playing field in Manchester, England, for his usual grueling workout. He ran passing and kicking drills. He was repeatedly tackled. He lifted weights. By the end of practice he was exhausted. Usually Mackenzie would head back to the locker room and soothe his sore body with a hot shower. On this day, however, an enclosed pod resembling a massive standing tanning bed beckoned from the nearby parking lot. Mackenzie and a couple of his teammates stepped inside. Frigid gas started to swirl around them.
