The main idea is that having significantly more free time for training does not allow for a drastic increase in running volume, because the adaptive capacity of muscles and tendons remains the primary limiting factor, regardless of any reduction in daily life stress.

noli's read

The community is converging toward a cautious approach, emphasizing that the biology of connective tissues imposes strict physiological limits that additional rest cannot fully erase. Studies on progressive overload (such as those discussed in the Journal of Orthopaedic & Sports Physical Therapy) confirm that injury risk is more closely linked to rapid changes in workload than to external stress levels. The idea that sleep and better recovery allow for accelerated adaptation is partially true but often exaggerated; while rest aids repair, it does not replace the time required for bones and tendons to thicken. The 10% rule is recognized as an arbitrary but useful safety tool, though it is imprecise for highly trained athletes. In short, science supports the idea that patience remains the best lever, as mental recovery capacity does not always compensate for structural vulnerability to repetitive impact.

the sources

1. 1Gabbett TJ 2016
2. 2Carey DL, Blanch P, Ong KL, Crossley KM, Crow J, Morris ME 2016
3. 3r/AdvancedRunning