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The average 5K time for men, plus other key running stats.
The precise mathematical formula you need to train for a marathon.
Research shows how testosterone affects marathon times.
The same protein that helps you run fast also makes you smarter.
What to eat and drink during a race—from 5K to Ultramarathon.
The mental trick that can help you exercise longer.
Mark is up for pullups but down on sprints.
Michael underlines the importance of balance in all facets of training.