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Reviewed: Feature-packed wearables great for sports

A smartwatch or fitness watch can be an invaluable aid to getting fit and healthy. Find out what the Apple Watch 4 can offer compared to the wearables from Fossil, Garmin, Huami and Suunto that went through our latest round of testing.

Why are some fitness trackers so inaccurate?

A recent study by the University of British Columbia concluded that Fitbits and other fitness trackers are often highly inaccurate. That’s no surprise to Which?: our tests have exposed devices that leave you with no clear idea of how much activity you’ve done - whether that's steps taken or calories burned.

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