The best Fitbit GPS tracker for runners, including the Fitbit Charge 3, Fitbit Versa and Fitbit Altra

Plus, where to buy a cheap Fitbit. Whether you’re new to running, or looking for a fitness tracker you can use in the gym as well as at Saturday morning's parkrun, you’ll likely have a Fitbit on your wishlist. But what is a Fitbit GPS tracker and which is the best one to run with? What is a …