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Build a core that can withstand anything.
The ultra-runner will take on the "Spartathlon" for a charitable cause.
If you're strong in a wind tunnel, you can be strong on the ground.
It's airborne and adrenaline-charged—and it'll get you ripped.
How Nathan Waterfield gets jacked to chop wood.
The third stop of the tour was set in Polignano a Mare.
When getting a great wave means putting your life on the line.
Thinking of trying out? Use these tips from real-life competitors.