…in running, the moment someone says “HIIT,” my mind shuts off. There’s nothing inherently wrong with the phrase (it means “High-Intensity Interval Training”), and I’m not trying to be rude. Instead, it’s a natural reflex developed over time.[Using HIIT is] a signal that the person standing in front of me has only a basic grasp of endurance development. How can I discern this from one phrase? Endurance coaches don’t use HIIT in their vocabulary. They recognize the nuance of interval training; that there is a large difference in someone running 200-meter repeats in 30 seconds versus 32 seconds. In the beginner personal-trainer world, this nuance is lost, and they all get thrown into the HIIT category.
~ Steve Magness, The Peak Performance Newsletter