For many people a brisk jog along a level city street is an accomplishment. Others may brave a charity 5K race and feel proud. Yet for some people to challenge themselves high walls, huge logs and a lot of mud are required.
There are more obstacle course events like the Tough Mudder, Spartan Race or Warrior Dash taking place than ever before. There is a proliferation of endurance runs of 100 miles or more and one of the most extreme trails in America, the Manitou Incline, is a local hot spot.
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