How to Use Your Wearable for Work

You check your Oura readiness over coffee, see 62, register that it’s lower than you’d like, then close the app and walk into a 9am strategy meeting anyway. By 11am you’ve reread the same paragraph four times, and your brain feels like static.

Most of us are walking around with one wearable, sometimes two, generating a constant feed of data on sleep, HRV, readiness, recovery, steps, stress, cycle phase and occasionally glucose. We know the numbers and share them at dinner parties but tend not to use any of it once we sit down at our desks.

That’s the productivity opportunity sitting unused. The data you’re already generating, from devices you already own, can tell you what your brain is best built for today. The piece that’s still missing for most people is the translation from biology into a real decision about what to work on.

What your wearable is already telling you

If you own an Oura, a Whoop, an Apple Watch, a Garmin, or you simply log your cycle in Flo, you already have most of what you need. The signals worth caring about for work are these:

•      Sleep score. A composite of sleep duration, sleep quality (REM, deep sleep) and consistency. If your sleep score drops significantly then  your prefrontal cortex (the bit running focus, decision-making and self-control) is operating on a real deficit, whether you’ve noticed it yet or not.

•      HRV (heart rate variability). A read on how your nervous system is coping with the cumulative load it’s carrying. When HRV drops, it’s a flag for stress, under-recovery or both, and research consistently links lower HRV to weaker executive function and slower decisions.

•      Readiness or recovery score. Most rings and bands aggregate sleep, HRV, resting heart rate and recent strain into a single number, which is a surprisingly useful daily forecast for cognitive bandwidth.

•      Cycle phase. If you track yours via Flo or Apple Health, you have a four-week map of the estrogen and progesterone shifts that affect verbal fluency, social cognition, focus, mood and detail work.

•      Stress and skin temperature trends. Persistent rises tend to show up in the data before you consciously feel them, which makes this a useful early signal for catching burnout before it bites.

None of this is abstract. Together these signals act as a daily forecast of what your brain is built for, in the same way a weather app forecasts what to wear.

How biology shapes a workday

Three signals do most of the heavy lifting at work, and once you understand what each one is actually telling you, the implications for how you spend your hours become difficult to ignore.

Sleep is the cognition tax. A poor night doesn’t simply make you “a bit tired”; it affects working memory, attention, emotional regulation and risk assessment in ways that are measurable rather than vibes based. A sleep score of 58 is a different brain than a sleep score of 88, and that brain is the one walking into your 9am whether you like it or not.

HRV is your stress receipt. When HRV drops, your parasympathetic system (the calm-and-focus one) is being out-shouted by your sympathetic system (the alert-and-defend one), and a 2019 systematic review in Frontiers in Neuroscience found a consistent association between lower HRV and weaker executive function. You can still work on those days, but the kind of work you’ll actually be good at narrows: detail-heavy, methodical tasks tend to land, while new strategy, brainstorming and difficult conversations tend to fall flat. Similarly, as HRV improves, so too does emotion regulation, with worry, anxiety and anxiety all reducing. 

The cycle is the four-week pattern most people ignore. Estrogen rising into ovulation is correlated with sharper verbal performance, higher social confidence and a stronger mood baseline, which is why pitches and negotiations often feel disproportionately easier in the days before ovulation hits. Progesterone rising in the luteal phase brings a more methodical, detail-oriented brain that’s brilliant for quality control and rough for optimism, and that’s biology rather than failure.

Stack the three signals together and you have a daily readout that’s far more accurate than asking yourself “how am I feeling?” at 8am over a flat white.

Athletes have been doing this for a decade

The reason none of this is speculative is that elite sport has already proven it works, sometimes spectacularly so.

In 2020, Chelsea FC Women became the first football club in the world to tailor their training programmes around players’ menstrual cycles, adjusting load, recovery and nutrition to hormonal state in order to improve performance and reduce soft-tissue injuries. The approach has since been picked up by national teams, Olympic squads and Premier League clubs.

Sleep and HRV tracking have followed a similar trajectory in the NBA, where franchises now aggregate player data to set practice intensity, travel rhythm and rest decisions. Knicks guard Jalen Brunson, who wears an Oura ring, summed up the shift in a single line: “Readiness is the most important thing. Mentally and physically ready every single day.”

The pattern in both cases is the same. Data goes in, a decision comes out, and the athlete doesn’t push through a low-readiness day pretending it’s a green-light one. There’s no obvious reason that logic should stop at the locker-room door, given that a 10am board presentation is closer to a 10am match than most knowledge workers care to admit. Both demand focus, working memory, emotional control and recall under pressure, and both go better when the person doing them has trained to their numbers rather than against them.

What this looks like for the rest of us

The real shift is from “I have data” to “my data made a decision,” and once you start working that way, the difference compounds quickly:

•      Sleep score 58. The deep work window goes to systematic, methodical tasks, and the brainstorm moves to Thursday when readiness is forecast to be back up.

•      HRV trending down across four days. The difficult one-to-one with your direct report gets rescheduled, and so does the salary negotiation you’ve been gearing up for.

•      Cycle day 11, estrogen rising. The pitch goes on the calendar today, alongside the networking lunch you’ve been putting off for a fortnight.

•      Cycle day 22, progesterone brain. Pattern recognition, editing and quality control go on the list, while the blank-page strategy doc is parked until your follicular phase.

This is the part that Oura, Whoop, Apple and the rest of the wearables don’t currently do for you. They surface the number on a clean dashboard and leave the interpretation, and the reshuffling of your task list, entirely up to you.

How to use this with Phase

Phase is building a future where you can use your wearable for a better workday.  We are building connections between your wearables including Oura, Whoop, Apple Health, Garmin, Google Health and Flo, and the productivity tools you already use – connecting the dots between your biology & your work.

Firstly, Phase ranks your tasks by bio fit, pulling in your list from Linear, Todoist, Notion, Asana, Trello or Google Tasks and reordering it based on what your brain is best built for today. Second, it aligns your calendar to the week ahead, showing exactly where your peak windows and your low-readiness windows are sitting against existing meetings, so you can protect the right hours and push lower-stakes work into the lower-readiness ones. Third, it translates the numbers into an actual decision, which means no more interpreting your own readiness score over breakfast or second-guessing whether today is a strategy day or a systems day.

You stop being your own analyst, and go back to being the operator.

The takeaway

Your wearable is the most underused productivity tool you already own, and elite athletes have spent the last decade showing what happens when you train and recover to the data rather than ignore it. Knowledge workers stand to gain the same upside, and most of us are leaving it on the table because nothing in the existing productivity stack closes the loop between what your device sees and what your calendar actually does.

A new era of Phase is coming.  Sign-up to Phase to stay up to date with these changes. 

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