The short answer
Use your own symptoms and how you feel to inform training adjustments. Research does not establish one phase-based programme that every woman should follow. Keep a useful routine, allow flexibility and seek care for symptoms that disrupt your life.
A practical starting point
Some months you notice a clear pattern: cramps make one session uncomfortable, or the days before your period feel harder. Other months the pattern is less obvious. That does not mean you have failed to understand your hormones.
Cycle-aware training can begin with a simpler question: what is affecting today's session, and would an adjustment help?
What research can and cannot tell us
A widely cited systematic review found that average performance differences across menstrual-cycle phases were small, with substantial variation and generally low-quality evidence.[1] That does not establish a universal phase-based programme. Nor does it tell an individual woman that her symptoms do not matter.
The practical implication is modest: notice your own experience rather than assuming a predicted phase tells you how strong, motivated or capable you must feel. The review concerned naturally menstruating women; do not automatically apply its findings to every hormonal-contraception pattern or to irregular cycles.
There is no need to make a new promise about “optimising hormones” to justify adjusting an uncomfortable workout.
Keep the programme; allow an adjustment
A useful routine has enough structure that you know what you are working towards, and enough flexibility that one difficult day does not become a problem.
If you feel well, you do not need to reduce the session simply because an app labels the day as a lower-energy phase. If symptoms are interfering, you could consider a shorter session, less resistance, longer rests or a different activity that feels manageable. If you feel unwell, resting may be appropriate.
These are practical options, not prescriptions for each phase. They should also fit any advice you have received about a medical condition.
For example, someone who usually completes three sets might choose two on a day with uncomfortable but familiar symptoms. Someone else might prefer a walk. Neither choice creates a rule that every future period needs the same response.
Track enough to notice, not enough to become preoccupied
If tracking feels useful, keep a brief record of bleeding, symptoms, sleep and how the session felt. Include everyday context: a late night or a difficult workday may matter to your experience too.
Across a few cycles, look for repeated observations rather than explanations you cannot verify. “I often find long sessions harder on my first bleeding day” is a usable observation. “My hormones mean I cannot build muscle this week” is a much larger claim.
If tracking adds anxiety or becomes another obligation, simplify it or stop. You can respond to symptoms without documenting every day.
Symptoms deserve care, not just a lighter workout
Do not assume severe or worsening pain, very heavy bleeding, fainting, or repeated disruption to ordinary life is something you should manage through training adjustments alone. Seek medical advice. Changes to your cycle, including missed periods, can also warrant discussion; take a pregnancy test if pregnancy is possible.
Sudden severe symptoms or feeling acutely unwell call for prompt assessment. Do not wait to complete a tracker before asking for help.
When you do speak to a clinician, concrete examples help: how symptoms affect sleep, work and activity, how long they last, and what has changed.
A note on this article
General education, not a hormonal assessment or treatment plan.
A practical example
On a day with familiar uncomfortable symptoms, you might shorten the planned session or choose a manageable walk. If you feel well, an app-predicted phase alone does not mean you must reduce training.
Try this next
before your next session, check how you feel, identify one relevant symptom or constraint, and decide whether the planned workout still fits. Let that decision be enough.
Want more structure?
This article is a useful starting point. What Should You Actually Do on a Rest Day? offers a more complete framework to keep building on it.
Explore What Should You Actually Do on a Rest Day? →