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In December of 2014, we spoke with Brian MacKenzie, founder of crossfit endurance, ultrarunner and co-author of "Unbreakable Runner, Unleash the Power of Strength & Conditioning for a Lifetime of Running Strong". \\xa0He joined The Nation to talk about how you can train for lifelong healthy and sustainable running by incorporating crossfit endurance training. \\xa0The main principles include:
Get the book HERE
Brian\'s other book, " Power Speed ENDURANCE: A Skill-Based Approach to Endurance Training"
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