First of all, can we go directly? Searching for the keyword "heart rate" in the App Store can find many applications that can test heart rate on the iPhone.
2. Then when the system prompts whether to let the software access the camera, click the "Allow" button.
3. Then register in the software for free.
It will show how to test the heart rate, that is, cover the camera and flash with your fingers.
When you see the flash on the back of iPhone, you can cover the camera with your finger and flash. If the position is placed correctly, the animation effect currently being measured will be displayed on the screen as sound.
6. Of course, there are also some third-party devices that can be connected to the iPhone to measure the heart rate. Apple's upcoming Apple Watch can also be used to measure the heart rate.