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Hi Leon,
I have a Fitbit Versa 3, which I wear daily ... mostly to tell the time and let me pay for things with Google Wallet.
However, it does give you access to quite a lot of information.
Heart rate;
Heart rate variability;
resting heart rate;
O2 sats (on the watch only);
elevated heart rate zones;
sleep duration (it tracks light, deep and REM sleep, as well as awake times during the night);
Daily readiness (some algorithm about how tired it thinks you may feel. I don't really pay much note to it);
Cardio load for the current day. eg my target today was between 22 + 47, but I am currently at 121. Physically, it was a big day;
Steps taken (I am not convinced that this is accurate);
Distance covered (I think it works on steps multiplied by stride length);
Calories burned;
Floors climbed;
Plus a few others, all in the free version of the app.
A lot of it is unnecessary I reckon, but the sleep tracker seems quite accurate.
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