Apple Watch Series 12 help you better understand your body and everyday fitness. A redesigned system of optical and electrical sensors, powered by the S11 chip, supports more frequent heart rate measurements. Improved sensors and larger, energy-efficient green LEDs provide more data about heart activity.
Each morning, the readiness summary shows you a simple score based on recent activity, vital signs, and sleep. The value changes dynamically throughout the day, helping you adjust the pace of your workouts and everyday tasks to your current energy level.
The watch tracks sleep quality, including its duration, the regularity of falling asleep and waking up, and individual sleep stages. The morning sleep score provides a clear report. The HRV feature measures heart rate variability as often as every five minutes and helps track the body's response to stress and recovery.