Two riders can have the same fresh numbers and completely different results. This week: a study that says you might be able to grow your blood while you sleep, just by tilting the bed. What it really shows, what it does not, and who should bother. Plus, why the hardest part of coaching is saying no, and why the wrong yes costs more than any no.

The study: Mazza et al. Erythropoiesis is regulated by changes in posture. Acta Physiologica, 2026. doi:10.1111/apha.70248.

This week's video: The Best and Worst Cycling Training Sessions

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Daily cycling intelligence from SEMIPRO CYCLING, produced with AI-assisted research, scripting, and synthetic voice.