I built a one-page return-to-play checklist for grade II hamstrings that blends prevention with rehab — Nordic volumes, progressive max-velocity exposures, and LSI ≥90% held dynamometer before reintroduction — and it’s worked well with our U17 squad this fall. If you’ve got thresholds or templates you like (e.g., Askling H-test criteria, sprint exposure targets during weeks 3–6), I’d love to compare notes.