RUNNING PACE vs HEART RATE vs RPE (How Your Body Lies to You)

"Is heart rate training better than using running pace to gauge your effort in training? In this running tips video, I'm going to discuss the pros and cons of using heart rate, pace and RPE to make sure that you're running at the correct intensity during your marathon training. This is such an important aspect of your training as a runner, as the intensity you're running at will dictate how your body adapts and your speed and endurance develops. "