Life insurance underwriting has, for a long time, been a single, heavily scrutinized moment. A medical exam, a blood panel, a questionnaire about family history and lifestyle, and from that snapshot, an insurer builds a risk classification that follows the policy for years, sometimes decades. The model assumes that a person’s risk profile, once assessed, stays reasonably stable, or at least stable enough that re-underwriting every year would not be worth the cost.

Wearables are – for the better – quietly testing that assumption.

A handful of insurers have built products around continuous health data rather than a single point-in-time assessment. John Hancock’s Healthy Engagement Rider, built on the Vitality program, gives policyholders discounts on wearable devices and rewards them for staying active, with the explicit aim of encouraging behavior correlated with longevity.

The mechanism is straightforward enough, as when you hit certain activity thresholds, tracked through a connected device, the cost of insurance can be reduced through a rider credit applied to the policy.

What makes this different from a one-time underwriting discount is the word continuous. The data does not stop after the policy is issued. It keeps flowing, and the premium can move with it, with John Hancock noting explicitly that premiums based on Vitality status may decrease, stay level, or increase each year depending on participation. The underwriting moment has stretched from a single appointment into an ongoing relationship between the policyholder’s daily habits and what they pay.

There is a built-in safeguard worth noting, because it matters for how nervous people should be about this. John Hancock states that it will not use medical or other information collected through the program, after the policy’s issue date, to change a risk classification or as the sole basis to deny a reinstatement request.

That is a meaningful boundary. The wearable data feeds a rewards and discount structure layered on top of the original underwriting decision, not a continuous re-underwriting of the base policy itself. The two are easy to conflate, and the distinction is doing more protective work for the policyholder than it might appear to at first glance.

Even with that boundary in place, the direction is worth sitting with. The reason life insurers have historically priced risk at a single point in time is that continuous monitoring was not available. Now it is, and the industry has started building products around the fact that it is.

What started as an optional wellness incentive, step counts and discounted devices, sits adjacent to a much larger pool of biometric data that wearables generate constantly: heart rate variability, sleep quality, and in some devices, blood oxygen and irregular heart rhythm alerts.

None of that is currently flowing into core underwriting decisions at scale. But the infrastructure to do so, technically, already exists, and infrastructure tends to get used eventually once the data is already being collected for one purpose.

The comparison to telematics in auto insurance is close enough to be useful and different enough to matter. A car’s behavior is observable in the moment, speed, braking, time of day, and the insurer’s interest in that data is fairly narrow: will this specific trip or pattern predict an accident?!

Health data is different in kind. It touches on conditions a person may not yet know they have, patterns that could reveal far more than the wellness reward was designed to capture, and a body of information that, once collected, sits under a patchwork of health privacy regulation that varies considerably by jurisdiction and was largely not written with consumer wearables in mind.

The customers opting into these programs tend to be the ones who would likely qualify for favorable rates anyway, healthy, active, and already inclined toward the kind of habits the program rewards. That is its own quiet selection effect. The people most worried about what continuous monitoring might reveal are the ones least likely to sign up for it, which means the programs currently look more like a loyalty mechanism for already-healthy customers than a genuine shift in how risk gets assessed.

Whether that stays true is the more interesting question. Wearable adoption keeps climbing, and the devices themselves keep getting better at detecting things a step counter never could. The boundary insurers have drawn today, rewards and discounts, not reclassification, is a policy choice rather than a technical limitation. Luckily enough, there is an incentive for both insurers and insureds to revisit them.

The medical exam used to be the entire underwriting story. Now, with the extension of wearables that evolves better every day, it is no longer obvious where that story ends.