Menstrual cycle & training
The menstrual cycle brings hormonal swings that, for some athletes, carry through noticeably into energy, recovery, body temperature and how training feels. How strongly varies enormously from person to person — and that is exactly why general per-phase rules often work poorly.
The phases of the cycle
A cycle is usually described in phases. Roughly: menstruation (day 1 is the first day of bleeding), the follicular phase after it (oestrogen rises; many athletes feel energetic here), around ovulation (the release of the egg, somewhere in the middle) and the luteal phase after it (progesterone dominates; some notice more fatigue, a slightly higher body temperature and resting heart rate, and sometimes PMS symptoms). The length of a cycle and of each phase varies strongly between people and from month to month.
Important: these are average patterns, not laws. One athlete notices barely any difference across her cycle, another very clearly. Contraception, age and health change the picture too. So a single universal "train like this in this phase" scheme is more marketing than science.
Why personal data wins here
Because the effects are so personal, the honest approach is to track your own cycle and look at what actually goes with it for you — with your recovery, your sleep, your HRV and how your sessions feel — before drawing conclusions. A pattern that returns across several cycles says something; a single off day says little.
That way the cycle stays one signal alongside the others, not a separate set of rules that overrides your training. The goal is understanding and context — recognising why a week feels different — not being prescribed what you should do "in phase X".
How Trimetra personalises this
Cycle tracking in Trimetra is opt-in: log the start dates of your period, and the app derives your cycle day and phase from your own cycle length and shows it alongside your training. There are no fixed training rules per cycle phase: the effects differ strongly from person to person. Only once you’ve logged enough across several cycles does the app look at whether your phase demonstrably says something for you — for example whether comparable easy sessions around your period or in your premenstrual week consistently feel harder. For now that stays insight that gives context; it doesn’t override your plan, and you decide what to do with it.
Frequently asked questions
Can you train normally during your period?
Yes — there is no general rule that advises against training during your period. How it feels differs per person and per month. Your own experience across several cycles says more than any schedule.
Why does training feel harder in the week before your period?
In the luteal phase progesterone dominates, and some athletes notice more fatigue, a slightly higher body temperature and resting heart rate, and sometimes PMS symptoms. But this is an average pattern, not a law: one person barely notices anything, another a lot.
Should you adapt your training to your cycle phase?
Universal "train like this in phase X" schedules are scientifically weakly supported — differences between people are too large. Rather track your own cycle and see what demonstrably correlates for you before drawing conclusions.
Every term at a glance in the full glossary.