# Training around your menstrual cycle: what the evidence supports > Should you train differently in each cycle phase? A plain guide to what meta-analyses show, how to log your own pattern, and when to see a clinician. Published 2026-11-12 · Updated 2026-11-12 · revns editorial Most people do not need to train differently in each phase of the menstrual cycle. The best meta-analysis to date found that exercise performance may be trivially lower in the first days of a period than in other phases, and the authors said the effect is too small and too variable to support one rule for everyone. The practical advice is to train to plan, track how you feel across a few cycles, and adjust only when your own data shows a pattern. This guide covers what researchers have found, what they cannot yet say, how to build a simple cycle log, and when to see a clinician. **TL;DR** | Question | Short answer | | --- | --- | | Does cycle phase change performance? | Trivially on average (2020 meta-analysis of 78 studies); individuals differ | | Does it change strength or muscle gain? | Not shown; a 2023 umbrella review called firm claims premature | | Do I need a phase-based plan? | No. Start from a normal plan, then personalise from your own log | | Can exercise help period pain? | Yes in trials: 29 randomised trials found lower pain scores than controls | | What should I log? | Day of cycle, energy, sleep, session quality, pain, bleeding | | How long before I judge a pattern? | At least three cycles | | See a clinician if | Pain is severe, bleeding is heavy or changes, periods stop, or you feel faint in training | ## What are the phases of the menstrual cycle? A cycle counts from the first day of bleeding to the day before the next period starts. Researchers split it into [menstrual cycle phases](/dictionary/menstrual-cycle-phases). The follicular phase runs from the first day of bleeding to ovulation. The luteal phase runs from ovulation to the next period. Oestrogen rises through the follicular phase and peaks before ovulation. Progesterone is low until ovulation and then rises in the luteal phase before falling again. Many studies split the cycle into six parts: early follicular, late follicular, ovulation, early luteal, mid-luteal and late luteal. That is the split the main meta-analysis below used. Cycle length varies. A regular cycle is often described as roughly 21 to 35 days. Studies on performance usually enrol [eumenorrheic](/dictionary/eumenorrheic) people, meaning people with regular cycles who are not using hormonal contraception. So their findings do not cover irregular cycles, hormonal contraception, pregnancy, postpartum or menopause. ## Does cycle phase change how well you perform? The largest review is a 2020 systematic review and meta-analysis in *Sports Medicine* by McNulty and colleagues. It included 78 studies; 51 had data suitable for the first analysis and 73 for a network meta-analysis that compared all phases. Outcomes covered both endurance and strength. What it found: - The pooled effect was trivial: performance was slightly lower in the early follicular phase than in the other phases combined (effect size -0.06, 95% credible interval -0.16 to 0.04). That interval includes zero. - The biggest gap between two phases was between the early follicular and late follicular phase (effect size -0.14, 95% credible interval -0.26 to -0.03). - The early follicular phase ranked lowest for the likelihood of poor performance (30 percent), with the other phases ranked higher. The authors' own conclusion matters more than the numbers. They wrote that performance might be trivially reduced in the early follicular phase, but because the effect is trivial, between-study variation is large and many included studies were poor quality, general guidelines on exercise across the cycle cannot be formed. They recommended a personalised approach based on each person's response. In plain words: on average the difference is small, and your own difference may be larger, smaller or absent. ## Does cycle phase change strength or muscle gain? A 2023 umbrella review in *Frontiers in Sports and Active Living* by Colenso-Semple, D'Souza, Elliott-Sale and Phillips looked at the reviews themselves. It examined meta-analyses and systematic reviews on cycle phase and resistance training. It found highly variable results across the reviews for strength, performance and hypertrophy. It also noted a pattern of poor and inconsistent methods, such as weak confirmation of which phase people were in. Their conclusion, stated as the authors' opinion, was that it is premature to say that short-term hormone fluctuations appreciably affect acute performance or longer-term strength and muscle gains from resistance training. A small 2025 study in *The Journal of Physiology* points the same way. In 12 young females who did controlled one-leg resistance exercise for 6 days in the late follicular and again in the mid-luteal phase, muscle protein synthesis was similar in both phases. For example, the exercised leg was at 1.52 percent a day in the follicular phase and 1.46 percent a day in the luteal phase. The sample is small and short-term, so treat it as supporting evidence, not proof. What this means for you: there is no reason to skip heavy lifting in a given phase because of a belief that gains will be wasted. Standard guidance for building strength still applies. See the [strength training for beginners guide](/blog/strength-training-for-beginners) for a simple week. ## Why do the studies disagree? Several things make this research hard: - **Phase confirmation.** Counting days from a period is a guess. Hormone tests (blood or urine) are the reliable way, and many studies skip them. - **Small samples.** Many studies have a few dozen participants or fewer. - **Different tests.** One study measures a sprint, another a one-rep max, another time to exhaustion. - **Average versus individual.** A group average of "no difference" can hide people who feel much worse in one phase and people who feel better. - **Symptoms are not performance.** Cramps, bloating, low mood or poor sleep can make a session feel hard even when the measured output is the same. That last point is why a log is useful. Your numbers (weights lifted, pace, heart rate) and your feelings (energy, mood, sleep) are two different records, and they can disagree. ## How can I find my own pattern? You do not need hormone tests or a special app. You need a record that lets you compare cycles. A simple method: 1. **Mark day one of bleeding** each cycle. Note the cycle length when the next one starts. 2. **Log each day** (10 seconds): energy 1 to 5, sleep quality 1 to 5, any pain 0 to 10, and whether bleeding is light, medium or heavy. 3. **Log each session**: what you did, your effort on a 1 to 10 scale ([RPE](/dictionary/rpe)), and whether it felt easier, normal or harder than the numbers suggest. 4. **Wait three cycles** before you draw any conclusion. One bad week can be caused by work stress, poor sleep or illness. 5. **Look for a repeating pattern**, such as "days 1 and 2 are low energy" or "the week before my period I sleep badly". Ignore patterns that appear once. If you do see a pattern, change the plan in small ways. Examples: - Lower the load or the volume on your lowest-energy days, and keep the day. - Move a hard session to a day where you usually feel better, if your week allows it. - Swap a long run for an easy walk or an easy spin on days when pain is high. - Protect sleep in the days when it drops. The same method applies to mood, which the [guide to tracking mood and energy next to training](/blog/how-to-track-mood-and-energy-next-to-training) covers in more detail. The [AI fitness coach feature](/features/ai-fitness-coach) shows how revns can hold your logs and training together so you can look at them in one place. revns does not diagnose, and the log is a record for you and your clinician, not a verdict. ## What helps with period pain and heavy days? Period pain (dysmenorrhoea) is common. The NHS says it usually lasts up to three days and is often a normal part of the cycle, and lists gentle exercise such as yoga, swimming, walking or cycling among the things that may help, alongside a heat pad, a warm bath and over-the-counter painkillers. It also says cutting down on alcohol and not smoking may help. A 2025 systematic review and meta-analysis in *Frontiers in Medicine* by Xiang and colleagues pooled 29 randomised controlled trials of exercise in people with primary dysmenorrhoea, which means period pain without an underlying condition found. Exercise lowered pain on a visual analogue scale compared with usual care, health education or no intervention (weighted mean difference -2.62, 95% CI -3.29 to -1.95). The review also compared types of exercise, and sessions of different length and frequency. Treat the finer comparisons with care: trials were small and varied, and the people in them knew they were exercising, so some of the effect may come from expectation. For training on painful days: - Keep it light and rhythmic: a walk, easy cycling, an easy swim or gentle yoga. - Reduce the load, not the habit. A 20-minute session counts. - Use heat and rest if you need them. Skipping a day is fine. - If you take painkillers, follow the leaflet or ask a pharmacist. This guide does not recommend any medicine. ## What about food, iron and energy? Bleeding loses iron, and heavy periods can lower iron stores. Low iron can cause tiredness, breathlessness on effort and poor training tolerance, but those symptoms have many causes and only a blood test can tell. If you are always tired, have heavy periods and train hard, ask a clinician about testing instead of guessing or starting supplements on your own. For everyday eating, spread protein across meals and eat enough overall. Iron-containing foods include lentils, chickpeas, kidney beans, tofu, tempeh, pumpkin seeds, fortified cereals, dark leafy greens, eggs, red meat, poultry and fish. Plant iron is absorbed less well than iron from meat, and vitamin C foods (citrus, peppers, tomatoes) eaten in the same meal can help; tea and coffee with the meal can reduce absorption. This works for vegetarian, vegan, eggetarian and Jain patterns, with the usual Jain limits on root vegetables. The [protein guide](/blog/how-much-protein-per-day) and [meal tracking feature](/features/meal-tracking) cover amounts and logging. ## What should I do this week? If you are new to training or tracking: - Pick a normal plan: two to three strength sessions and some brisk walking. - Start the daily 10-second log: energy, sleep, pain, bleeding. - Do not change your plan around your cycle yet. You are collecting data. If you already train regularly: - Add cycle day to your training log if it is not there. - After three cycles, compare your lowest- and highest-energy days with the training numbers. Move or lighten one session only if the pattern repeats. - Keep one rule fixed: you never train through chest pain, fainting or sharp pain just because the plan says so. If you compete or train at a high level, a sports medicine clinician or dietitian can help you interpret your data. The research above is on average effects and cannot tell an individual athlete what to do. ## When should I see a professional? See a GP or clinician if: - Your periods stop for three months or more and you are not pregnant, or have stopped or become very irregular while training hard. That can mean low energy availability or another cause that needs a check. - Your periods become more painful, heavier or irregular, or you bleed between periods. The NHS lists these as reasons to see a GP. - Period pain stops you doing your daily activities, or you have pain during sex, when peeing or pooing. - You have a swollen tummy, loss of appetite or weight loss you did not intend. - You feel dizzy, faint, have chest pain or an unusual racing heart during exercise. Stop and seek care. Urgent: the NHS says to ask for an urgent GP appointment or call NHS 111 if pelvic or period pain is severe or worse than usual and painkillers have not helped. In an emergency, call your local emergency number. Low mood in the days before a period that affects your life is also worth raising with a clinician. If you ever feel unsafe or think about harming yourself, contact your local emergency number or crisis line straight away. ## Related - [Menopause exercise: strength, sleep and bone health](/blog/menopause-exercise-strength-sleep-bone-health) - [Strength training for beginners](/blog/strength-training-for-beginners) - [How to track mood and energy next to training](/blog/how-to-track-mood-and-energy-next-to-training) - [How much sleep do you need](/blog/how-much-sleep-do-you-need) This is general training guidance, not medical advice. It does not diagnose or treat any condition. ## Sources - [McNulty KL et al. The Effects of Menstrual Cycle Phase on Exercise Performance in Eumenorrheic Women: A Systematic Review and Meta-Analysis. Sports Medicine 2020](https://doi.org/10.1007/s40279-020-01319-3) - [Colenso-Semple LM et al. Current evidence shows no influence of women's menstrual cycle phase on acute strength performance or adaptations to resistance exercise training. Frontiers in Sports and Active Living 2023](https://doi.org/10.3389/fspor.2023.1054542) - [Xiang Y et al. Efficacy and safety of therapeutic exercise for primary dysmenorrhea: a systematic review and meta-analysis. Frontiers in Medicine 2025](https://doi.org/10.3389/fmed.2025.1540557) - [Menstrual cycle phase does not influence muscle protein synthesis or whole-body myofibrillar proteolysis in response to resistance exercise. The Journal of Physiology 2025](https://doi.org/10.1113/jp287342) - [NHS. Period pain](https://www.nhs.uk/conditions/period-pain/) ## Questions ### Should I train differently in each phase of my menstrual cycle? The evidence does not support a fixed plan for everyone. A 2020 meta-analysis found that exercise performance may be trivially lower in the early follicular phase (the first days of bleeding) than in other phases, but the authors said general guidelines cannot be formed and a personalised approach is better. Track how you feel and perform for a few cycles and adjust only if a clear pattern shows up. ### Will lifting during my period hurt my progress? There is no good evidence that it does. A 2023 umbrella review of meta-analyses and systematic reviews found highly variable results and concluded it is premature to say that short-term hormone changes appreciably affect strength or muscle growth from resistance training. If you feel well, train as planned. If you feel poor, an easier session is a fair choice. ### Can exercise ease period pain? In a 2025 meta-analysis of 29 randomised trials in people with primary dysmenorrhoea (period pain with no underlying condition found), exercise lowered pain scores compared with usual care, health education or no intervention. The NHS also lists gentle exercise such as yoga, swimming, walking or cycling as something that can help. Severe pain that painkillers do not ease needs urgent medical advice. ### Does hormonal contraception change how I should train? Hormonal contraception changes the hormone pattern, so the cycle-phase research on people with natural cycles does not apply directly. The sources used here do not give training rules for contraception users. Track your own energy and sessions, and talk to a clinician if side effects affect training or daily life. ### How do I know which phase I am in? Day one of bleeding is day one of the cycle. Counting days gives a rough guide only. Researchers use blood or urine hormone tests to confirm phases, and they say that poor phase confirmation is a common weakness in the studies. For training, you do not need to confirm phase: log the day of your cycle and how you feel. ### When should I see a doctor about my periods and training? See a clinician if periods stop for three months or more when you are not pregnant, become much heavier, more painful or irregular, if you bleed between periods, or if pain is severe. Also see one for dizziness, chest pain or fainting during exercise. For pain that is severe or worse than usual and painkillers have not helped, the NHS says to seek urgent help. --- Canonical: https://revns.com/blog/training-around-your-menstrual-cycle-what-evidence-supports Index of everything: https://revns.com/llms.txt revns gives training guidance, not medical advice.