Training with your menstrual cycle: science or fad?

What the (still modest) science suggests

• Some women report more drive and strength in the follicular phase, and more fatigue or discomfort at the end of the luteal phase and during menstruation.
• Research on 'periodizing training by the cycle' is still limited and inconsistent. There's no solid proof that a rigid per-phase protocol beats well-structured, progressive training.
• Individual variation is enormous — your own cycle is more informative than any generic app rule.

How to use it practically (no dogma)

1. Listen to your body and log it: note energy, sleep, mood and performance across the cycle. Your pattern is worth more than the theory.
2. Adjust, don't stop: on lower-energy days, you can reduce load or volume without abandoning training. Light movement often even eases cramps.
3. Ride the peaks: if you feel stronger in a certain phase, it can be a good time to chase records — without turning it into a straitjacket.
4. Consistency still rules: the biggest factor in results is still training progressively and regularly over the months, not chasing the perfect phase.

The warning

Missing periods in someone who trains a lot and eats too little isn't a 'sign of discipline' — it can indicate an energy deficit with risks to bone and hormones (so-called RED-S). That's a case for a doctor, not to be ignored.

A word from the Lair: this content is informational and does not replace medical care. Menstrual changes linked to intense training deserve professional evaluation.