What I’ve realized—and what science proves—is that running slow just doesn’t come naturally to most runners. The same instinct that I had as an eleven-year-old new runner exists also within countless other runners of all experience levels. It’s an impulse to make every run “count” by pushing beyond the level of total comfort. This instinct makes a lot of runners rather hard to coach. It’s one thing to give a runner a training plan that is dominated by low-intensity workouts; it is quite another thing for that same runner to actually stay below the ventilatory threshold in all of those
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