One piece of running wisdom that I've accepted for a long time but recently started to question is the idea that most of training should be done with a controlled approach. If you watch videos of athletes and their coaches doing workouts you'll often hear the coach saying that the most important thing is that they stay relaxed--"RELAX! RELAX!!" The whole video is them screaming "RELAX!!" They'll say that the only time they want to go 100% is during a race or maybe a few key workouts leading up to a big race.
"RELAX! RELAX!"
The idea is that going too hard too often can fry the nervous system and slow recovery between sessions. It's like there's a continuum between Low Intensity, High Volume that Produces Little Stimulus for Adaptation and High Intensity Low Volume that Produces High Stimulus for Adaptation. And most training plans seem to want to aim for like 80% Intensity. That seems to be where most people can train the longest without breaking down and still get a fruitful response.
It all seems very sound and there's plenty of anecdotal and clinical evidence to support it but something really irks me about coaches preaching RELAX! and DON'T PUSH in workouts. Yesterday I was reading this tweet from Steve Magness about how the way the brain and body perceive discomfort is super subjective. If you tell an athlete to relax and go easy, then you're priming their system to notice any discomfort and it tends to make the reps feel harder. By the same token, races where athletes push as hard as they can can feel relatively easy. You're priming the body to ignore as much as discomfort as possible for the sake of performance.
Caveat: it is absolutely the case that you can assign 4 reps in a workout and an athlete goes way too hard on the first one and can't run the last 3 reps with any quality. But I would argue that thinking about relaxing and staying controlled and patient isn't the only way you can achieve smart pacing. You can try hard and still pace well.
