It works by judging your sleep quality based on heart rate, restlessness – you get marked down for tossing and turning even if you’re asleep while you do so, which is something many other sleep trackers don’t do – time awake and sleep stages. Shout out to the sleep-tracking function (recovery and all that, right?). But it falls down on sessions such as hill runs and fartlek sessions, where it seems to struggle to keep up with the changes of pace (and, thus, heart rate). Heart rate is very good on ‘normal’ runs – that is to say, steady-state runs, regardless of pace. So, again, if you’re a dedicated athlete, this will probably not give you the depth of info you’re after.įor you cloth-headed types, if you forget to hit start on the Fitbit, fear not: the SmartTrack software will auto-detect that you’re doing exercise, decide what type (walk, run, HIIT etc) and log it in the app afterwards. The data from your run is nicely presented in the Fitbit app, with enough graphs, charts and maps to keep design geeks happy – but it’s not great at giving you a developing picture of your progress as a runner, just a snapshot of that run. So this is not going to be a marathon option – or even half-marathon option for most. The longest run we did with the Charge 4 was just over 1:40 and after that the battery was down to around 20 per cent. It offers seven days in normal mode and Fitbit claims a life of five hours in GPS mode. The downside of this is that the battery life in GPS is poor. The GPS (built in for the first time on a Fitbit tracker) performed impressively well compared with a Garmin Fenix 5 and an Apple Watch, so if accurate pace/distance stats are your only/main concern and you’re not interested in other factors, the Charge 4 will meet your needs. That said, the touchscreen controls work well without you having to paw at the device – a bugbear of ours – and there is one button on the side that can also be used to wake the screen, as well as pause/resume sessions. The pixelation means it’s tricky to see on the run, and the Apple Watch-style ‘sleep screen’ function – where you raise your wrist to turn the screen on – doesn’t work well consistently. The screen is too slim and visibility is poor.
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