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Apple also notes that you should do this calibration for 20 minutes at each of the speeds you typically walk or run at. This helps calibrate the Apple Watch accelerometer for your stride length at each of these different speeds, improving the calculations for calories burned, distance traveled, and the calculation of Exercise minutes. When calibrating, it’s also crucial to start your Outdoor Walk or Outdoor Run when you’re ready to begin and end it as soon as you’ve finished. The Apple Watch will include any idle time in its calibration, which can confuse the algorithms. It’s also worth noting that if your iPhone is nearby, older Apple Watch models will rely on the GPS from that, which could also mess things up in some cases. For example, if you leave your iPhone on a bench or in your car where it’s close enough to stay connected or reconnect to your watch while you’re walking or running around an outdoor track, it won’t record any GPS movement. This won’t be a problem if you’re wearing a 2022 or later Apple Watch model; the Apple Watch Series 8, Apple Watch Ultra, and second-generation Apple Watch SE, and newer models always use the built-in GPS. However, if you’re using an Apple Watch Series 7 or older, you’ll need to either take your iPhone with you on your workout or shut it off entirely so the Apple Watch switches to its internal GPS.