If you are looking to send a heartbeat on your Apple Watch, you can use the Digital Crown to generate a heartbeat from the watch. To do this, press and hold the side button (located just below the Digital Crown) and select the “Send Heartbeat” option from the menu. You will then be able to choose a contact from your list of contacts; the recipient will need an Apple Watch for the heartbeat to be sent. Once selected, you will see the animation of your heartbeat being sent. The recipient will feel a gentle tap and hear a sound prompting them to open their watch to see and feel your heartbeat.
In addition to sending heartbeats to a contact, you can also use the feature to share your heartbeat with the Apple Watch Activity app and users who have enabled sharing in the Activity app. This will allow your friends and family to share in your activity goals.
The heartbeat feature is an Apple Watch exclusive that allows you to show someone you care in a creative and unique way.