Always ready for the pool or ocean. Apple Watch Series 3 is swimproof and tracks both pool and open-water workouts. After you\\\'re done, sound vibrations eject water from the speaker. Keep tabs on your heart rate. Anytime. Apple Watch Series 3 measures your heart rate throughout the day - while you\\\'re resting, walking or in the recovery phase after a workout. The Heart Rate app also notifies you if your heart rate rises above a set threshold when you\\\'ve been inactive for a 10-minute period. Apple Heart Study. The Apple Heart Study will use data from Apple Watch to identify irregular heart rhythms, including those from potentially serious heart conditions such as atrial fibrillation. This innovative research study is conducted in collaboration with Stanford Medicine and with helpful guidance from the US Food and Drug Administration. Breathe App. Quiet your mind. Relax your body. Stay centered as a beautiful animation and gentle taps guide you through a series of deep breaths. Reminders help you practice mindfulness every day. And you can see your heart rate when you\\\'ve finished with your session. Sit less. Move more. Get some exercise. Three simple rings show how active you are every day and can inspire you to move more to close them. See if you\\\'ve been sitting too much. Track how many steps you\\\'ve taken and calories you\\\'ve burned. And aim for 30 minutes of exercise, even if it\\\'s not all at once. Smart coaching. A nudge when you need it. Like a personal trainer, Apple Watch Series 3 gives you the motivation you need. In the morning you\\\'ll see personalized progress updates, and in the evening you\\\'ll get a suggestion for how to close your rings. You\\\'ll even receive a new challenge each month based on your activity and workout history. Third-party health apps. The right apps can play an active role in reminding you to keep up with healthy regimens and routines. Whether you want to drink more water, improve your sleep or better manage a condition like diabetes, Apple Watch Series 3 lets you add the apps that will help most.