How to train in each phase of your cycle

Key takeaways

• Performance changes across the cycle are small and differ from woman to woman.
• The best guide to intensity is how you feel on the day.
• Keep strength training all month: change the dose, not the habit.
• Regular exercise may ease period pain.
• Sharp, severe or unusual pain means stop and get checked.

Training by phase at a glance

Days are for a 28-day cycle. Yours may be shorter or longer.

Does your cycle change how well you train?

A little, perhaps, and not in the same way for everyone. A 2020 meta-analysis found that performance might be trivially lower in the early follicular phase, the first days of your period, than in the rest of the cycle.¹

The review pulled together 78 studies. Because the effect was so small, the results varied so much between studies and many studies were low in quality, the authors said general rules could not be made. Instead, they recommended a personal approach based on how each woman responds.¹ These studies looked at women with natural cycles. If you use hormonal birth control, your hormone pattern is different, so let how you feel guide you even more.

Should I plan strength training around my cycle?

You can, but you do not have to. The studies that compare phase-based strength plans are small, and the results are mixed.

In one trial, 20 women trained one leg mostly in the follicular phase and the other leg mostly in the luteal phase, for three cycles. The leg trained mostly in the follicular phase gained more strength.² That is interesting, but it is one small study. A 2023 review of the published reviews found highly variable results and many studies with weak methods. Its authors said it is too early to conclude that hormone changes across the cycle meaningfully affect strength or muscle growth.³

A sensible middle ground: push harder in the weeks when you feel strong, which for many women is the week or two after their period, and keep training steadily the rest of the month.

Should I keep strength training all month?

Yes, if you feel well. The NHS advises adults to do strengthening activities that work all the major muscle groups on at least 2 days a week, and that advice does not pause for any phase.⁴

Skipping a week of every cycle adds up to a lot of missed training. On harder days, change the dose instead of stopping: use a lighter weight, do fewer sets, rest longer, or swap heavy lifts for slower, controlled ones. On good days, go for it.

Can I work out on my period?

Yes. If you feel fine, train as normal. If you have cramps or low energy, gentle exercise such as walking, yoga, swimming or cycling may help.⁵

A 2019 Cochrane review found that regular exercise, about 45 to 60 minutes three or more times a week, may reduce period pain, although the evidence was low in quality.⁶ In those studies, women exercised throughout the month, not only on their period. So moving regularly the rest of the time may be one of the best ways to make period days easier.

How should I warm up?

Take about 5 to 10 minutes in every phase, starting easy and building up to your working weight or pace.

Begin with light cardio such as brisk walking, rowing or cycling. Then do a few mobility moves for the joints you are about to use, and one or two lighter sets of your first exercise. A warm-up also tells you how your body feels today. If your legs feel heavy or your joints feel stiff, that is useful information for how hard to go.

How do sleep and recovery fit in?

Recovery is part of training, and sleep is a big part of recovery. A poor night is a good reason to train lighter the next day.

Some women sleep more lightly in the days before their period, as our luteal phase guide explains. In those days, keep training but lower the intensity if you feel flat, eat enough protein and carbohydrates around your sessions, and protect your rest days. A cooler bedroom and an earlier wind-down can help too.

When does pain mean stop?

Stop if pain is sharp, sudden or getting worse as you move. Muscle burn and mild period cramps are common, but sharp or unusual pain is not something to train through.

Ask for an urgent doctor's appointment if your pelvic or period pain is severe or worse than usual and painkillers have not helped. See a doctor too if your periods become more painful, heavier or irregular, if pain stops you doing your usual daily activities, or if you bleed between periods.⁵ Get emergency help straight away for chest pain, fainting or sudden severe pain.

How do I put this into practice?

Keep a steady base of strength and movement all month, then adjust the intensity to your phase and, above all, to how you feel that day.

Regime Longevity builds your workouts from your goals, your training history and your phase, next to a daily food plan for that phase. You can ask the AI concierge to change the plan when your day changes. If you are new to exercise, pregnant, or managing a health condition, check with your doctor before you start.

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