Training by Pace, RPE, or Heart Rate — Which Should You Use?

When it comes to running training, one of the most common questions athletes ask is:“Should I train by pace, heart rate, or how I feel?” The answer?It depends. Each method—Pace, Heart Rate, and RPE (Rate of Perceived Exertion)—offers a unique lens for guiding your training. But they’re not interchangeable, and using all three simultaneously can …