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Research shows how testosterone affects marathon times.
The same protein that helps you run fast also makes you smarter.
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.
Mark is up for pullups but down on sprints.
Mark purchases a spear to work on his throwing technique.
Any training you do should motivate you to succeed.