I find the Interval exercises tracking feature almost useless because the watch face display cuts out after 10 seconds. Since the strenuous activity period is only 25 seconds (and the rest period is 1:30), I have to immediately tap the face or turn my wrist to make the activity changes on time. These are strenuous, fast-moving exercises where repeatedly fiddling with the Fitbit is difficult and distracting. I understand that a continuous display will (perhaps greatly) shorten battery life between recharges, but I'd rather recharge frequently (even after every Interval exercise) than have my Charge 2 be incompatible with short duration, quick-change exercises.
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