Temperature sensor³ provides retrospective ovulation estimates and advanced cycle tracking features⁴Measure your blood oxygen with a powerful sensor and app²Take an ECG anytime, anywhere¹Get high and low heart rate, and irregular rhythm notifications¹Advanced safety features, including Fall Detection, Emergency SOS,⁵ and Crash DetectionEnhanced Workout app with more advanced metrics and ways to trainA completely redesigned Compass app with waypoints and BacktrackTrack your daily activity on Apple Watch, and see your trends in the Fitness app on iPhoneCall, text, and email with just a few tapsListen to your favorite music, podcasts, and audiobooksMake purchases instantly and securely from your wrist with Apple Pay⁷Large, Always-On, edge-to-edge displayAll-day battery life and fast charging⁸Sleep stages tracking lets you see how much time you spend in REM, core, and deep sleepwatchOS 9 features an enhanced Workout app, a new Medications app, sleep stages, and greater insights into heart healthApple Watch comes with 3 free months of Apple Fitness+, featuring 11 different workout types, from HIIT to Yoga, and even meditations⁹