Quick question about the heart rate sensor. I never tend to pay it much attention, but did note today when resting on the glance that I had a heart rate of 42. Concerned it was low, I checked my archive and found ten dates it trended low over the past 18 months. Leaving the glance on throughout the afternoon, it dropped into the 40s ten or so times, and with the glance remaining on jumped from 42 to a more reasonable number, 75, 85 directly. At one point after walking several feet, it calculated 50, then 112, then 88 in succession. I do have a physical coming up, but just for standard use, is it common to see such varying successive shifts in heart rate?