Eric Jarvis

Eric Jarvis is an endurance coach, ultrarunner, and obsessive student of human potential. With over a decade of experience in long-distance racing and performance coaching, Eric has helped athletes—from first-time 50K hopefuls to elite mountain runners—go farther, faster, and with fewer stress fractures. He’s known for combining science-backed training strategies with real-world pragmatism (and the occasional bad joke).

A firm believer that ultrarunning should be challenging but never joyless, Eric distills the overwhelming world of endurance sports into clear, actionable guidance that works in the mud, on the mountain, and in your everyday life. When he’s not running ridiculous distances or deep-diving into lactate threshold research, you’ll find him eating post-run burritos and reminding his clients that walking is not weakness—it’s strategy.

Mastering the Ultramarathon is his definitive guide to the sport he loves: gritty, humbling, and wildly rewarding.