Samsung’s New Watches Turn Health Data Into Guidance

Samsung’s New Watches Turn Health Data Into Guidance

A smartwatch can measure heart rate, sleep, movement and body composition throughout the day. The harder problem is deciding what those numbers mean. A single reading may be normal for one person and unusual for another, while daily changes can be connected to exercise, stress, poor sleep or other factors.

Samsung’s Galaxy Watch9 and Galaxy Watch Ultra2, announced on July 22, 2026, are designed around that interpretation problem. Instead of presenting every measurement as a separate statistic, the watches use Samsung Health to compare several signals, establish personal baselines and turn the results into simpler scores and recommendations.

From Measurements to Personal Context

The updated Vitals feature creates a personal overnight baseline using heart rate, heart-rate variability, breathing rate, skin temperature and blood oxygen saturation. Rather than treating one measurement as a warning on its own, the system looks for changes that differ from the wearer’s usual pattern.

Heart Health Score takes a broader approach. It combines information such as activity, sleep, body composition and stress trends into one cardiovascular-wellness score.

Fitness Index uses body-composition measurements and workout history to assess whether a person’s exercise level is appropriate. Daily Cardio Load then compares recent workout activity with estimated recovery needs, helping the wearer decide whether to train, maintain their current activity or rest.

These tools do not turn the watches into medical diagnostic devices. Samsung states that the features are intended for general health, wellness and fitness purposes. Some functions also require several days of recorded activity before they can provide meaningful guidance.

Two Watches for Different Uses

Galaxy Watch9 is the everyday model. It is available in 40- and 44-millimetre sizes and is designed for continuous activity, sleep and recovery tracking.

The 40-millimetre version has a 390mAh battery, while the larger model has a 445mAh battery. Both use Qualcomm’s Snapdragon Wear Elite platform and include displays rated for up to 3,000 nits of peak brightness.

Galaxy Watch Ultra2 is the more specialised version. Its 47-millimetre body contains an 800mAh battery, which Samsung says offers 35% more capacity than the previous Ultra model.

The company also says an internal redesign makes the watch 12% thinner despite the larger battery. Its display can reach a localised peak brightness of 5,000 nits, although actual brightness may vary depending on temperature, surroundings and usage.

Running and Hydration Guidance

The Ultra2 introduces a Trail Run mode that tracks elevation, climbing progress and cumulative ascent and descent. This gives runners more information about how changes in terrain may affect workout intensity and pacing.

Its hydration guidance estimates sweat loss relative to body weight and recommends how much fluid may be needed during supported activities. The calculation is intended to make hydration guidance more specific than a general reminder to drink water.

Taking Health Tracking Underwater

The Ultra2 also expands smartwatch tracking beneath the surface. When the wearer enters the water, it can automatically record depth, dive time and water temperature.

Samsung lists 10ATM water resistance, an IP69K rating and EN13319 certification, a standard connected to depth-measuring diving instruments. More advanced diving functions developed with diving-equipment company Mares are expected through a separate application later in 2026.

Those planned functions include real-time ascent and descent rates and information related to decompression time. Their usefulness will depend on the final software, supported locations and how accurately the watch performs during real dives.

What Is Actually New

The innovation is not one individual sensor. Most of the underlying measurements already exist across the smartwatch industry.

The change is Samsung’s attempt to combine those measurements into a more understandable picture of daily health, training and recovery. The watches are designed to move beyond telling users what happened and provide guidance about what the information may mean.

That approach still has limitations. Personal scores depend on consistent wear, correct sensor contact and enough historical information to establish a reliable baseline. A simplified score can make complex information easier to understand, but it can also hide uncertainty.

Independent testing will be needed to determine how accurately the watches measure exercise, recovery, sleep and health changes under real-world conditions.