We spent eighteen years
making stress measurable.

Nothing else works until the measurement is right, so we started there. We were among the first teams the NIH funded to detect stress from wearables in real life rather than in a lab. Plenty of groups took the problem on. Not many stayed with it long enough to get it right, and every dead end we hit is in the peer reviewed record.

Eighteen years in, the accuracy was finally good enough to change behavior, on the ordinary smartwatches people already own. We proved it in a nationwide study.

One thing about how we ran it. Most stress tracking research trains a model and tests it on the same data afterwards, which tells you the model fits that data and not much else. We deployed ours pre trained, with no fine tuning on the study at all. If it worked, it would work for anyone, unchanged. We called the study MOODS, the Mobile Open Observation of Daily Stressors.

Then something happened we had not designed for. Across a hundred days, the hundred and twenty two participants simply seeing their own data started changing their behavior on their own, in fourteen distinct ways, and their stress came down: ten percent less intense, and ten fewer stressors a month. We did not expect that. Most stress interventions do something in the moment and nothing that lasts past the study.

Almost everyone treats stress as the price of doing well. It is also a driver of chronic disease, but that damage is slow and invisible, so the connection never feels real. We needed a way to make it real, and we found one: your heartbeats.

Your stress response was built to save your life. It raises your heart rate and pushes energy to your limbs so you can fight or run. It still does that today. But you are in a chair, nothing uses that energy, and it turns into low grade inflammation instead, which is a known path to chronic disease.

That rise in heart rate is what we measure as Workload Heart Rate. Here is the part that changed how we think about it. You get a lifetime budget of heartbeats, and spending it slower means living longer: five beats per minute off your resting heart rate is worth about a year. Spend heartbeats on exercise and you get them back, because your heart runs slower the rest of the day. Spend them on stress and they are gone. Exercise is an asset. Stress is a liability.

It costs you today as well. Under stress your brain is busy calming your nervous system, and it will take the decision that makes the stress stop over the decision that is right for you or your team. You have less patience with people. If you lead anyone, that is not a private problem, and it is why our executive users check they are calm before something that matters.

This part is harder than it looks. Tell someone they had a stressful day and you have added disappointment to a bad day. Interrupt them while it is happening and you have broken their work and probably made the situation worse.

That is why just in time intervention has not worked for stress, and adding large language models to it did not fix anything.

So we built around the thing that did work. Reflection is what moved people in MOODS, so reflection is the base. On top of it goes a predictive nudge carrying your coach's own words, sent before a hard moment while you can still do something about it, rather than in the middle of one when you cannot.