Sublime
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After hundreds of tests and several racing seasons, it was evident that the pace a runner could perform at his or her max aerobic heart rate—the MAF Test—was positively correlated with race pace. I collected more data for 5K and 10K distances and charted this information
Philip Maffetone • The Big Book of Endurance Training and Racing
Typically, these adjustments are achieved by increasing and decreasing overall running volume rather than by fiddling with the balance of intensities.
Matt Fitzgerald • 80/20 Running
I describe the ideal of the running form you’ll soon be learning as “performance” because “form” is at the heart of the word. Without form, there’s no performance, full stop.
Eric Orton, Christopher McDougall (Foreword) • The Cool Impossible
The clearly defined MRV concept allowed us to educate coaches about training volume limitations, so they could lead their athletes to continual performance gains.
Dr. James Hoffmann • How Much Should I Train?: An Introduction to the Volume Landmarks (Renaissance Periodization Book 5)
Hal Koerner's Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Miles and Beyond
amazon.com
If you want to race faster, quicker training paces at the same heart rate are essential.