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 mobility
• Focus on nutrition

Get the book HERE

Brian's other book, " Power Speed ENDURANCE: A Skill-Based Approach to Endurance Training"

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