What It's Like to Run an Ultramarathon: The Stages of Suffering

Wonder what it's like to run an ultramarathon? Our editor ran 100-mile and 100K races to find out what it's like to run an ultra.

Inside the Pain Cave With Ultrarunning GOAT Courtney Dauwalter - The Ringer

Harvey Lewis set a backyard ultramarathon record by running 450 miles for four and a half days – while barely sleeping

Six Things to Consider if You Want to Run an Ultramarathon

Trail and Ultra Running Injuries and How to Heal Up! - Run Infinite

Running - Wikipedia

Your Guide to Ultramarathon Running

Losing Running Fitness: A Scientific Look at How Much You'll Slow Down When Not Able to Run - Runners Connect

Backyard ultra marathons: the world's craziest races - Sports Illustrated

Ultra pain, ultra gain: the rise of the ultramarathon – Business Destinations – Make travel your business

Relentless Forward Progress: A Guide to Running Ultramarathons: Powell, Bryon, Grossman, Eric: 8601400487846: : Books

I Needed to Keep Running to Heal Myself” - Outside Online

Utah man prepares to run 100-mile race after beating stage 3 colon cancer

What It's Like to Run an Ultramarathon: The Stages of Suffering

How I Got Hooked on Ultrarunning

How to Train for Your First Ultra Marathon

Building up to an ultra marathon - Women's Running

South Carolina Ultra Marathon

The World's Oldest Ultramarathon Runner Is Racing against Death