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Zach Bitter is a 100-mile record holder. He eats almost no carbs.
Put your physical skills to the test with these challenging workouts.
The key to do both? Timing, a new study says.
The funnyman made the announcement via a hysterical video.
Everything you need to know to run, swim, and bike to victory.
What you need to know before taking on a big race.
The trick to improving endurance without losing muscle.
Prepare your body to avoid injury and improve performance.