There are tons of fun things you can do with an Apple Watch, including various options to keep track of your health. If you want to keep track of your pulse rate (heart rate), the Apple Watch has you covered, too.
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- Pair your Apple Watch to your iPhone, if you haven't already done so.
- Unlock your Apple Watch. Place it on your wrist closing the wrist strap around your arm, tap the Watch's face twice, and enter your pin.
- Access your Watch's clock face for a moment.
- Press the button just below the digital crown on the Watch. This will send you to what used to be called Glances (quick access widgets).
- Scroll through the list from left to right until you spot the "Heart Rate" widget. Tap on the glance/widget to access it.
- Give it a second to access your pulse. You won't be able to see it well, but on the Apple Watch version 3.0 (or later), when the Watch is reading your pulse, it'll send a green beam of light from the pulse sensor into your skin, which will radiate back the information.
- Review your pulse rate. Assuming you keep your iPhone paired with your Watch through the Bluetooth connection, your Pulse rate will be recorded as data on the Health app on your phone.
- Exit out of the glance if you'd like. Even if you exit, the Watch will continue to record this data for you. It'll take your pulse after about every 10-12 minutes while you're wearing the Watch.
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Source: http://www.wikihow.com/Check-Your-Pulse-on-Your-Apple-Watch