We use threshold training in the 2 months prior to racing, or within the racing season as maintenance. Higher intensity than threshold is often difficult to achieve when under a high overall work load, whereas threshold, tempo, or steady can be done effectively even when very fatigued. I agree that too much threshold could be 'toxic' but really it's just a work load issue. 'Polarized training' has become a bit of a buzzword - I don't worry too much about the label - of course the majority of the volume high level athletes do is an easy intensities - the rest is 'hard'. Nothing new or novel, and it doesn't need to be more complicated than that.

J

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