Your Apple Watch is equipped with a number of great ways to help you track your health, chief of which is its photoplethysmography-based heart rate sensor. Apple describes it as such:
This technology, while difficult to pronounce, is based on a very simple fact: Blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights paired with light‑sensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment. When your heart beats, the blood flow in your wrist — and the green light absorption — is greater. Between beats, it's less. By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute — your heart rate. The heart rate sensor supports a range of 30–210 beats per minute. In addition, the heart rate sensor is designed to compensate for low signal levels by increasing both LED brightness and sampling rate.
The heart rate sensor can also use infrared light. This mode is what Apple Watch uses when it measures your heart rate in the background, and for elevated heart rate notifications. Apple Watch uses green LED lights to measure your heart rate during workouts and Breathe sessions, and to calculate walking average and Heart Rate Variability (HRV).
By default, your Apple Watch will automatically check and log your heart rate every ten minutes; that data is then saved and synced to your iPhone's Health app, where you can view it in more detail. In addition, there are a number of ways to manually check your heart rate on your Apple Watch.
How to monitor your heart rate during a workout with Apple Watch
How to disable the Apple Watch's heart rate monitor during a workout
How to manually check your heartbeat with Apple Watch
How to see your resting rate and walking average
How to manually check your heartbeat from your watch face
How to check your heart rate during a Breathe session
How to monitor your heart rate during a workout with Apple Watch
When you start a workout, Apple Watch will begin actively monitoring your heart, recording its fluctuations every minute; after you end the workout, Apple Watch will continue this monitoring for three minutes afterward, so as to give you a "Recovery Heart Rate" (how well your nervous system regulates your heart after intense activity). You can see your heart rate at any time during your workout by raising your wrist, or by opening the Heart Rate app.
How to disable the Apple Watch's heart rate monitor during a workout
You can disable your Apple Watch's heart rate monitor altogether during workouts if you want to save power; doing so will give you a far less accurate estimate of your calories burned, though you'll still be able to record time- and distance-based metrics.
On your Apple Watch, go to the Settings app.
Tap on General > Workout.
Turn on Power Saving Mode.
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