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.
We take a look at the best GPS cycling watches, including Garmin and Suunto fitness watches and how to use your Apple Watch to track your ride.
Flagship fitness watches and trackers from Garmin, TomTom, Misfit and Withings are put under the microscope in our in-depth wearable testing.