Researchers are adding sensors to the Fitbit exercise monitor to measure wearers’ skin humidity and temperature. UNSW urban climatologist Negin Nazarian, with Clayton Miller (National University of Singapore) and Fitbit developers intend to create a measure of conditions, customised to an individual exerciser’s environment, which can also send data, crowdsourcing environmental information. CMM hopes Dr Nazarian writes the user-manual when they launch, CMM struggles to understand the info Fitbit sends him.