Mark Cullen is a high-performance endurance coach specializing in running, triathlon, CrossFit, and hybrid endurance sports. His practical, data-informed approach has helped athletes at every level build lasting fitness and reach their peak performance.

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Mark has coached 5× Ironman Triathlon champions, World-class CrossFit Games athletes — including Emma Lawson, Jack Farlow, and Dallin Pepper — and hundreds of competitive Runners pursuing PBs and World Majors qualifications from 5K to marathon.