NUA now takes your period into account when you train, without calculating your cycle

01It adapts to how you are today, not to a calculated phase

Plenty of apps try to adapt training to the phase of your menstrual cycle. They work out whether you're in the follicular, ovulatory or luteal phase and change the plan based on that estimate.

NUA doesn't work that way.

The reason is simple: there isn't enough evidence today to recommend training differently depending on the phase of your cycle. The largest review published to date — 78 studies and close to 1,200 women — found no clear effect on performance, and its own authors avoided making phase-based recommendations.

Then in 2026 came one of the best-designed studies on the question. It was done with strength training in the gym, where each leg can be trained separately: every participant trained one leg with the work concentrated in the follicular phase and the other in the luteal phase, across three consecutive cycles. That removed the differences between people — genetics, sleep, nutrition, stress — and made each woman her own control group.

The result was clear: neither approach produced better results. What explained the gains was total training volume, not the phase of the cycle.

There's also a practical problem. Without confirming ovulation with specific tests, the day of your cycle only allows for an estimate: it doesn't tell you with any certainty which phase you're in.

That's why NUA doesn't calculate phases, doesn't predict ovulation and doesn't adapt training to a calendar. It takes into account how you are, when you tell it.

If you want to understand the full evidence, we go through it in detail in our guide on training with your period and menstrual cycle.

02You don't have to explain it all over again every month

The hardest part usually isn't training on your period. It's having to explain the same thing every month.

If one day you tell NUA that for the first two days the pain means you can barely train, or that you'd rather do the indoor trainer at home than head out, you won't have to repeat it the following month.

And it doesn't stop at remembering. When it plans your week, it leaves that alternative ready in case you need it. Not because it has worked out that "your period is due", but because you'd already told it how you prefer to train when it happens.

When the moment comes, it offers you the option that fits you. The decision is still yours.

And if you'd rather it stopped taking it into account, you only have to say so.

03Common doesn't mean you have to put up with it

Period pain is common, including among women who train.

The problem is that being common ends up turning into "it's normal, put up with it". And those aren't the same thing: the fact that many women are in pain doesn't mean you have to simply live with it. In fact, that normalising is why some conditions take years to be diagnosed.

If NUA sees something worth raising with a doctor, it will tell you once, without alarm.

And that's where its job ends. NUA doesn't try to diagnose, doesn't recommend treatments and doesn't weigh in on contraception: that conversation belongs to a gynaecologist, not to whoever coaches you. From there, whether you go is your call.