Best fitness tracker guide 2018: Fitbit, Xiaomi, Garmin and more

If you're looking for a top fitness tracker – be it a activity band, fitness watch or clip-on – there's no shortage to choose from. Fitbit, Garmin, Xiaomi, Misfit, Polar are the leaders in the game, with activity bands to suit every budget and fitness level. And fitness trackers are becoming more feature rich –…