The Core Mechanism
Overload during max-effort sprinting or sudden speed work without adequate eccentric strength.
The Real-World Triggers
Hamstring rarely has a single cause. In runners, these are the consistent contributors:
- Sudden speed work without progression
- Weak eccentric hamstring strength
- Inadequate warm-up before fast running
- Glute weakness — hamstrings overcompensate
- Pelvic tilt and tight hip flexors
Why Runners in Particular
Running concentrates repeated impact and load through the same tissues thousands of times per session. Hamstring develops when that load exceeds the tissue's adaptation rate — usually because training spiked, recovery dropped, or strength didn't keep up.
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