India, Sept. 11 -- Apple is putting a stronger focus on health intelligence with the Apple Watch Series 12, combining a new Health Sensing System with the S11 chip to deliver more frequent heart rate and HRV measurements. The company says the result is its most accurate heart rate sensing in a wearable, alongside new tools designed to turn health data into more useful daily insights.

The shift is less about adding another set of fitness numbers and more about making those numbers easier to act on. The new readiness feature, for instance, uses activity, training load, vitals and sleep data to produce a single daily score.

The new Health Sensing System uses optical and electrical heart sensors, with larger power-efficient green LEDs allow...