Some people do an Ironman to find themselves. Tyler Merritt did it for a tattoo. Not metaphorically. The M-Dot — the iconic red logo of the Ironman Corporation — comes with an unwritten community rule: you don't put it on your body until you've crossed a finish line. Tyler wanted the tattoo. Everything else was just the price of admission. Becoming Iron Tyler is the story of how a forty-two-year-old tech executive, husband, and father from suburban North Texas decided that the best use of his limited spare hours was training for a 140.6-mile race — swimming two and a half miles in open water, riding 112 miles on a bike, and then running a full marathon — all in a single day. It is about the obsession that swallows endurance athletes whole, the cycling community in North Dallas that shaped his training, a supported rally through the mountains of Colombia, the night before a race when Ambien meets adrenaline and loses, and the long, dark miles up a hill in Tulsa when the body is mostly mush but the legs keep going anyway. It is also, honestly, about the specific insanity of the people who choose this sport for fun. The ones who are up before 4:30 AM on a Tuesday for no competitive reason anyone can explain. The ones who track a rival's Strava at 6 AM and do the sleep math. The ones who sign a pact not to buy a single piece of M-Dot gear until they've earned it — and who carry a bag of it still wrapped in plastic back to the hotel the night before the race, just waiting. Tyler crossed the finish line in the dark. The announcer called his name. He is, in fact, an Ironman. This is how it happened.