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As the prompt suggests, you should only do this if you’re having problems with the data being recorded by your workouts and you’re ready to recalibrate. This will return you to a clean slate in terms of calibration data, which could reduce the accuracy of your distance and exercise minutes until you’ve probably calibrated everything again. Nevertheless, if you are having problems, it’s best to get rid of this old data and recalibrate things from scratch, especially if you’ve been using an Apple Watch for a long time. Past calibration data is weighted against any future calibrations, which can continue to skew things. You should also ensure that your height, weight, gender, and age are entered correctly in Health Health Details in the Watch app and that Wrist Detection is turned on in the Passcode section. Accurate personal data is essential as the algorithms factor these into their calculations, and Wrist Detection ensures that your Apple Watch can take background heart measurements. These readings help set a baseline for your cardio fitness levels to determine what’s considered “brisk” exercise for you. Once you’ve confirmed all your settings are okay and your personal data is accurate, you can go to a flat outdoor area that offers good GPS reception and do a regular walk or run for at least 20 minutes while using the Outdoor Walk or Outdoor Run workouts in the Workout app. Ideally, this should be done in one go, but the Apple Watch will aggregate the data over multiple outdoor workouts, as long you’re running them in the Workout app each time.