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Hellen Obiri credited Athletics Kenya’s Menstrual Symptom Tracking program (News #337) for her world-record 10,000m run (28:58.21) at the 2025 Valencia Night Race on December 1, 2025. My coach knew *when* to push—because the data showed *when* I was strongest, she said. The system flagged her optimal window: Day 12 of her cycle, high energy, low pain. World Athletics called it a paradigm shift in female performance science. AK will expand tracking to all endurance athletes in 2026.