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Devices designed to simply count steps can be very inaccurate at estimating distance.

Marathon training? Here are eight fitness trackers to avoid – Which? News

With the London Marathon 2019 around the corner, we’ve laced up our trainers and put more than 100 activity trackers and smartwatches to the test. The least accurate based on distance while running underestimated by more than 40% – in a marathon (26.2 miles) that equates to almost 11 miles.

This has to be one of the most ridiculous “studies” on fitness tech that I’ve ever seen. And did somebody really have to run 37 miles to determine that a Garmin vivosmart 4 is not a particular good choice for marathon training?