So I have been using the Apple 4 watch for two months now. I have been remodeling a room in my house and usually log a mixed cardio session. Per session a am burning 2000+ calories (hanging and sanding drywall will do that to you). So today for giggles I decided to not log a mixed cardio and let the watch just monitor as normal. It states I burned 255 calories. So which is right? My thought is the watch when logging an exercise is constantly measuring heart rate where as not logging it is just sampling every so often. I know on my wife's Fitbit, if it senses she is more active than normal, it starts to monitor more closely and then assigns it to a general workout that she can rename later. It watches for 10 min before it takes up the monitoring. My polar A370 did the same thing. If your activity increased, it would monitor more closely. It looks like the Apple watch isn't recognizing my heart rate is up and that it should monitor more closely, does that seem like an accurate statement or is there a setting to get it to do that? While I don't want to overstate calories burned by logging a workout I also don't want to get ripped off as there are times where if we are walking around a lot and it turns into a hiking session, I don't want to not get credit for the burn because I don't start a session. Thx.