Training Essentials for Ultrarunning

Ben Pobjoy's Tips for Long Walks

Craig Modcraigmod.com
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In It for the Long Run: Breaking records and getting FKT

Damian Hall

amazon.com
Cover of In It for the Long Run: Breaking records and getting FKT

Scott Jurek Eat and Run: My Unlikely Journey to Ultramarathon Greatness

Philip Maffetone The Big Book of Endurance Training and Racing