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6 crucial exercises from a professional obstacle racer and trainer.
Test your endurance, and see some spectacular destinations in the U.S.
It's an all-terrain, run-anywhere mudstomper.
There's a good chance your day-to-day job is just too damn safe.
Don't miss out on these incredible races around the world.
Three epic choices for runners, bikers, and triathletes.
How do you sweat: "typical," "low-salt," or "salty"?
The toughest obstacles that elite military guys must survive.