Unbreakable Runner

T.J. Murphy and Brian MacKenzie

Unbreakable Runner UR 96dpi 300px_str

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CrossFit Enduranceā„¢ founder Brian MacKenzie and journalist T.J. Murphy challenge long-held beliefs about how to train for running.

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Brian MacKenzie

Brian MacKenzie CrossFit Endurance _96dpi_400pw UR

Brian MacKenzie is a strength and conditioning coach and the creator of CrossFit Endurance.

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