Mark Sisson is the former US national-class marathon runner and triathlete who launched the modern primal/ancestral health movement with Mark's Daily Apple, Primal Kitchen, and the Primal Blueprint book series. He has written 30+ books on health, training, and endurance, including Primal Endurance, which argued that aerobic-base development through low-heart-rate training was undervalued by the endurance community. For Roadman listeners thinking about long-term training durability, body composition, and the trade-offs of high-volume aerobic work, his work is one of the most-cited starting points.
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