My brand new Inspire 2 is not recording HR accurately during workouts. For context, during a HIIT type of workout where I was dripping sweat and struggling to control breathing, the device measured my HR as around 80, whereas afterwards the workout and after cooling down with breath work and meditation it registered my heart rate as 110. I’m confident that I am not so fit as to be around 80 bpm at close to 80% exertion. Otherwise the HR sensor seems to work fine during sleep and when resting. Also the device is in wrist mode and it was secure against my skin and the sweat was not running in between the sensor.
