Every published study, in one place. Observed, never predicted — the evidence is public.
Sports Evidence Lab analysed 169,902 valid marathon finish times across 30 event-year groups, comparing finish-time bands and pooled medians for London, Boston and Chicago.
SEL looked at 136,996 observed running journeys from 524,777 public 5k results to find playful patterns like Local Loyalists and Comeback Runners.