Unlike marathons and triathlons run on roads and trails, obstacleraces cover far shorter distances but ask participants to do far crazier things.
WSJ: Office Workers Run Extreme Obstacle Courses
2.
Less than 50, 000 people competed in obstacle style races in 2010, but that number soared to 1.5 million last year.
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3.
The partnership with Tough Mudder, which holds endurance races over obstacle courses, represents the first endurance event sponsorship for Under Armour.
FORBES: Under Armour Signs Groundbreaking Deal With Tough Mudder