Derivation Web

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# Alpha memo — exercise

**Headline:** Exercise: single-source alpha signal
**Alpha score:** 100/100 (internal triage score; not a certainty claim)
**Confidence:** `evidence_backed_signal`
**Memo surface:** `alpha memo`
**Snapshot:** `2026-05-25T06-25-13Z`
**Run:** `exercise-evidence-2026-05-25T06-25-13Z`
**Source thesis:** Anatomical site-specific effects of impact exercise on cortical and trabec…