Q: Heart rate problem with apple watch2

Hi

It is expected that Apple Watch may not be able to measure your heart rate during swimming workouts (due to the presence of water), but it still tracks Active calories using the built-in accelerometer.

For other workouts, Apple advises that, even under ideal conditions, Apple Watch may not be able to record a reliable heart rate reading every time for everybody.

For the best performance during workouts, ensure that you are wearing your watch sufficiently snugly on the top of yout wrist:

Apple suggests that you consider tightening your watch band beforehand and loosening it again afterwards. Other issues that can impact sensor performance include wrist tattoos and skin perfusion.

For any workouts that involve flexing your wrists, it may help to move your watch a little higher up your arm, away from the flexing joint.

If you continue to experience issues during your elliptical workouts, for more consistent readings you may wish to consider pairing an external heart rate monitor / Bluetooth chest strap to your watch:

• Use Bluetooth accessories with your Apple Watch - Apple Support

More information:

Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support

Work out with your Apple Watch - Apple Support

It might be a problem with your skin type. Apple watch uses a method that measures the amount of green light that the blood reflects, and your skin type may be blocking the light. A way to fix this include bluetooth accessories, or to use workout for activity where you actually move (Running, etc)