Why I (generally) assign effort based workouts

I drive the runners I coach crazy at times. Why? Well, I’m sure there are many reasons but one of the big reasons is because I assign workouts by effort. I don’t make it easy for them, saying something like mile repeats at 7:00 or half mile repeats at 2:50. Instead, I say mile repeats at 10K effort or even something more vague like slightly faster/harder than half marathon effort.
Why do I do this? Believe it or not, I’m not just trying to be difficult.
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