6. Heart Rate
Your resting heart rate is a great measure your general well-being. Measure your resting heart rate at the same time each day to spot upward or downward trends.

Place your finger so it covers both the camera lens (rear camera for the iPhone) and the flash and press the Start button. Press gently and move your finger around until you see a waveform and hear a beeping noise to indicate the sensor is collecting data. For best results, take measurements in a well lit room or outdoors and ensure your device is running the latest iOS version.

Sleep