Brian MacKenzie, founder of\xa0crossfit endurance, ultrarunner and co-author of "Unbreakable Runner, Unleash the Power of Strength & Conditioning for a Lifetime of Running Strong" with T.J. Murphy\n
joins The Nation to talk about how you can train for lifelong healthy and sustainable running by incorporating crossfit endurance training. \xa0The main principles include
\nGet the book\xa0HERE
\nBrian's other book,\xa0" Power Speed ENDURANCE: A Skill-Based Approach to Endurance Training"
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