“Book Descriptions: The sport of running is founded upon unchallenged beliefs about how to train. Unbreakable Runner tears down these traditions to reveal the new rules for fast, powerful running. The creator of CrossFit Endurance, Brian MacKenzie, dispels the tenets of run training like high mileage and high-carb diets to show how high-intensity training can make runners strong for races from 5K to ultra marathon.” DRIVE
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