It's hard to measure success when that line is constantly shifting.
Shortly after my first obstacle race in 2010 -- a Warrior Dash at a ski resort in New York, where I felt like I was going to die after making the mistake of sprinting the beginning and gassing out -- a friend said I should do something called a Tough Mudder in Vermont. I laughed and dismissed it. I was approaching 39, and even in my best days, there was no way I could have ever run a 10-mile race, never mind full of obstacles on a mountain.
But when friends said they were signing up for it, I figured if they could do it, I could. The idea of a Tough Mudder scared the hell out of me, and, fueled by fear, I trained my ass off. I came in a little over three hours, but I walked away with a nagging feeling that I could do better. I resolved to return the next year with new goals -- to qualify for World's Toughest Mudder (at the time, you had to qualify for WTM by being in the Top 5 percent of finishers) and to complete the Mount Snow, Vermont course twice in one day.
