On the 6s Pro. Have one too and the optical HR is still garbage sadly too - watch as it falls into sync with your strides and tells you your HR is 170 rather than 140 - and then along with that the casual lunch jog records as a full blooded race effort (and an kind offer to revise your threshold down)
On the 6s Pro. Have one too and the optical HR is still garbage sadly too - watch as it falls into sync with your strides and tells you your HR is 170 rather than 140 - and then along with that the casual lunch jog records as a full blooded race effort (and an kind offer to revise your threshold down)