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Mark tailors his training as the race date nears.
Sam Fox's training program leading up to his nationwide trek.
Get faster now with this high-intensity workout.
An exclusive look at four new challenges for 2014.
What you need to know before taking on a big race.
Tips from CrossFit vet Chris Spealler.
Mark analyzes his workouts and discusses his nutrition plan.
Michael and his team do some serious training.