What's Your Workout

An Ironman Who Wasn't Fit Enough

How CEO of Skullcandy Became a CrossFit Convert

Dec. 30, 2013 6:12 p.m. ET

When Hoby Darling, the CEO of Skullcandy Inc., was training for the Ironman 70.3 Hawaii, he thought he was the epitome of fitness. But after the 2009 race, which consisted of a 1.2-mile swim, a 56-mile bike ride, and a 13.1-mile run, Mr. Darling realized being fit for endurance races wasn't the same as being fit overall.

The 38-year-old says his focus on endurance training—he has competed in more than a dozen marathons and many Olympic distance triathlons since the early 1990s—meant he was ignoring strength, balance and...

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