Professor Stephen Seiler is back, and I wanted to pin him down on something specific: what has actually changed in the polarised training world since we last spoke? Because the research has kept moving, the debates have kept raging, and I know a lot of you have been asking whether the 80/20 model still holds up.
The short answer is yes — but with more nuance than before. Stephen walked me through the latest data on intensity distribution, and the big takeaway is that the principle remains rock solid. Where the thinking has shifted is around what happens inside that 20 percent. It is not just about doing hard work — it is about the quality and intention behind those sessions. A sloppy interval day counts against you more than most people realise.
We also got into the grey zone problem, which is still the single biggest mistake amateur cyclists make. Too many riders are doing their easy days too hard and their hard days too easy, and the result is a mushy middle that produces mediocre adaptations. Stephen explained how session RPE tracking can help you police this without overcomplicating your setup.
One thing I pushed him on was threshold training. There is a camp that says it has no place in a polarised model, but Stephen was pretty clear that for time-crunched riders, some threshold work makes sense. The dose just has to be controlled.
We covered masters-specific considerations too. The distribution does not change much, but recovery windows need more respect as you age. Sleep, stress management, easy-day discipline — these become the difference between making progress and just grinding yourself down.
If you have been sitting on the fence about how to structure your training, this one will give you the clarity you need.
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