Hi
When recording specific fitness activities, be sure to use the Workout app (or a third-party app) and to select the relevant activity type, including choosing Other for workouts that are neither included within nor sufficiently similar to those in the main list (for example, choose Other for weight training workouts).
This enables your watch to use the most appropriate sensors and data sources when tracking results and also, for certain workout types, to use tailored calorie calculations, including based on your heart rate, which is measured continuously during workouts.
For the best performance from the heart rate sensor during workouts, ensure that you are wearing your Apple Watch sufficiently snugly on the top of your wrist (but not too tightly). Apple suggests that you consider tightening the band before starting a workout and loosening it again afterwards.
The sensor is likely to give better results for workouts that involve rhythmic (eg running) rather than irregular movements. Other issues that can impact sensor performance include skin perfusion and wrist tattoos:
Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support
For workouts that involve flexing your wrists (such as lifting weights), it may help to move your Apple Watch a little higher up your arm, away from the flexing joint.
During general daily wear and when using the Workout app to record workouts when GPS data is either not relevant or not available, the Activity app and Workout app track your arm motion (measured by the accelerometer) when estimating results including Active calories.
For the best results, allow the arm on which you are wearing your watch to swing naturally as you move around during daily wear and to move as expected during workouts.
When walking the dogs, if you are not able to allow that arm to swing (due to holding dog leads), then, if you do not have a Series 2 Apple Watch, be sure to take your iPhone along, so that Location Services data from your iPhone can be taken into account by the Workout app when estimating your results.
You may also wish to consider resetting your existing calibration data and starting afresh. More information and instructions for doing so are available via the link below. They include calibrating for around 20 minutes at each of the speeds at which you may typically walk, jog or run. (Resetting calibration data will not erase your Activity history).
More information:
