28/09/2026
No two female runners experience their cycle the same way — the research backs that up. The biggest studies on cycle phase and performance found the effect is trivial. Most cycle-syncing advice runs ahead of the science. What actually works: track your own pattern for a few months. Your body, not a calendar, tells you when to push and when to ease off. Outrun has a full chapter on training with your cycle, iron, and more.
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