Why do most runners spend so much time running at moderate intensity? The discoverer of the 80/20 Rule, Stephen Seiler, found the reason may be that, unlike other forms of exercise, running has a minimum threshold of intensity. Very slow running is not running at all but walking. The average person naturally transitions from walking to running at a pace of roughly thirteen minutes per mile. If you start off at a slow walk and gradually increase your speed, you will find yourself feeling an urge to transition to running somewhere near that pace. Likewise, if you start off running and gradually
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