Take a look back at the inspiring weight loss journey of Marcus Cook. He lost nearly 300 pounds and completed the IRONMAN World Championship! Tonight, as he's in New York City for the world premiere of NBC's IRONMAN broadcast, we learn from Marcus how to "make everything in your life better."
Marcus Cook weighed almost 500 pounds when a dying friend implored him to shape up for himself and his family. In just a few years, he's learned to swim in his backyard Endless Pool and now races triathlons to inspire others to lose weight too.