Gareth Beer retweetledi

Many years of TrainingPeaks data from top cyclists I have worked with show a consistent pattern:
~40–60% of the best 5, 10 and 20 min power outputs were achieved during training in individually prescribed HIIT sessions
~40–60% occur during races.
In simple terms:
-Zone 2 builds the mitochondrial engine.
-HIIT adds the glycolytic turbo.
Both bioenergetic stimuli must coexist in a training plan of competitive and recreational athletes.
No engine ➡️ the turbo blows up.
This is why the Zone 2 vs HIIT debate is futile. It was never either/or.
If you want a deeper explanation: 👇
inigosanmillan.substack.com/p/zone-2-vs-hi…
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