I traveled to Poland to expose a charlatan, a prophet who claimed he could give ordinary people superpowers. He said he could control his body temperature at will, hijacked his immune system, and conquer the world's tallest mountains with no cold-weather gear. I'd built my career as an investigative journalist debunking people like him, but to prove he was a liar or a madman, I had to try his method. I'm not an athlete, I'm not exceptional, but I found a power that I never knew humans had. I heaked to the summit of Mount Kilimanjaro without a shirt. I sat on the snowy bank of a river until the ice melted around me. I trained with top athletes. Across the finish line of the world's most notorious cold weather obstacle course race, wearing nothing but shorts and a smile. I could do 80 push-ups on a single breath, and I lost 7 pounds of fat in 7 days. If I can do it, anyone can.