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Go off road with these seven tips from pro endurance athletes.
Research shows how testosterone affects marathon times.
What to eat and drink during a race—from 5K to Ultramarathon.
The mental trick that can help you exercise longer.
Michael admits one race challenge weighs heavily on his mind.
Nitrates may increase stamina by 16 percent.
Michael underlines the importance of balance in all facets of training.
Mark purchases a spear to work on his throwing technique.