Lots of great health data out there on sauna use and deliberate cold exposure. I would like to see Fitbit add a way to log and track both of these. Temperature ; time ; heart rate during. Thank You for your consideration. Take Care.
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Welcome back to the Fitbit community, @-zb!
Even if it sounds tempting, please do not wear your Fitbit device in a sauna or steam room. Fibit clearly advises against it:
IMPORTANT SAFETY AND PRODUCT INFORMATION