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Although the article mentions "polarization", when I look at the intensity distribution graph, is that not more an example of "pyramidal" - ie with a substantial amount of work between easy and hardest (VO2) intensities (see the bars for aerobic, tempo, threshold), rather than just being divvied up between Easy/VO2 with no-mans land in the middle. (see for instance, the definitions in this paper: https://www.frontiersin.org/articles/10.3389/fphys.2015.0029...)

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There are hundreds of definitions floating around. I think most people when talking about polarization isn't talking about the original definition, but merely the concept of having more volume and not always as much intensity.

It's a big shift, though. As someone mainly cycling I often get it a bit for "free", since it's natural to have rides being a couple of hours long and thus intensity is naturally lower. But when running, it can often feel like a run either needs to be long or fast.

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