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" with T.J. Murphy
joins The Nation to talk about how you can train for lifelong healthy and sustainable running by incorporating crossfit endurance training. The main principles include
Develop correct and efficient running skills
Build running endurance without injury
Build functional strength, conditioning and mobil...
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