Should ultra runners do speed sessions? Improving your ultra running

Speed is not associated with ultra running, but including speed sessions in your training can improve your long distance performances too.

Speed Work for Ultrarunners

Your Ultramarathon Training Plan: What to Expect

8 Things Ultrarunners Can Do to Improve Training Without an Additional Step - Jason Koop

Training for an Ultramarathon? You Still Need Speedwork. - RELENTLESS FORWARD COMMOTION

Free) 100K Ultramarathon Training Plan - RELENTLESS FORWARD COMMOTION

The Ultimate Trail Running 50k training guide -- From start to finish line

Speed-Based Workouts for Ultramarathon Training – iRunFar

Free) 100 Mile Ultramarathon Training Plan & Guide - RELENTLESS FORWARD COMMOTION

Tapering before you race: Less is more!

BE A BETTER RUNNER - digital download

How Ultrarunner Camille Herron Set Another World Record - The New York Times

Threshold Training How to Use T-Pace Running to PR