4 min read Welcome to Trail Tested , a new monthly column from entrepreneur and athlete Jack Espy as he trains for the grueling Leadville 100 ultramarathon this August. Trail Tested will follow Jack along his journey to do his first 100-miler to see what his body is capable of and what his mind can endure. Throughout his training he’ll be giving us a rundown of gear he’s been putting to the limit. OVER 15,000 FEET of elevation gain across steep climbs and high-altitude passes await me in August at the Leadville 100. But up to this point, the majority of my training miles have been on pavement. That’s because I live in South Florida. Here, we have no trails and no real elevation. The closest thing to any climb is a bridge. So instead of chasing vert and altitude, my training is built around volume. That means miles, and a lot of them. Because of that, I’ve spent this training block testing just about every road shoe I can get my hands on.…