“Marius, you are an Ironman, ” echoes through the speakers, as the crowd at the finish line erupts in cheers and applause. I feel like a champion, a hero. For the eighth time. I’ve just swum 3.8 km, biked 180 km, and run 42.2 km. One after another, in 12:33:20. Twelve and a half hours. Not my best...

