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.

Three Ways to Improve Your Ultra-Running Speed — James Runs Far

Should I Try to Improve My Distance or Speed?

The Ultramarathon Survival Guide - Trail Runner Magazine

Speed Training Work for Ultra Runners - Is it important?

Nicole Linke PT How To Use Speed Training To Improve Your Ultrarunning Performance

Your Ultramarathon Training Plan: What to Expect

Five Workouts for Cross Country

Best Running Workouts to Increase Speed and Endurance - Men's Journal

Speed Work in Running: What are they & Why is it Important? - ASICS Runkeeper