Marathon

Is Your Fitness Tracker Lying to You?

This weekend is the London Marathon, in which each participant will take around 33,000 steps to complete the course. But that’s an estimate – the only way to really know how many steps is to use a fitness tracker. Or is it?

Which? data reveals the dramatic difference between actual distances run and those reported by popular fitness trackers and wearable tech. Which? tests found that some trackers can be wildly inaccurate – over or underestimating distance covered by up to 32%, which on a marathon route could mean you miss the finish line by eight miles.

If marathon runners relied solely on wearables for accuracy on distance covered, many would not cross the finish line, and some would actually end up running an even greater distance! Their data shows that the most and least accurate brands are:

Fitness brands

Marathon distance at 26.2 miles

Percentage difference (whether above or below 26.2 miles)

Samsung

22.55

-14%

Polar

25.17

-4%

TomTom

25.17

-4%

Fitbit

25.43

-3%

Misfit

25.69

-2%

Garmin

25.69

-2%

Huawei

25.96

-1%

Withings

27.53

+5%

Apple

28.05

+7%

Pebble

30.68

+17%

Visit the full study for more info, and view their handy infographic below.




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