I just went for a long walk on uneven surfaces, which is my usual route for exercise. When I am wearing my bluetooth chest strap and connected to my iPhone using Digifit, I clock up about 500 calories (the same with a variety of other fitness monitors). It is consistent, and when I am using the chest strap and the Polar Loop, I get about the same results. However, when I use the Apple Watch and its Exercise App, I only got 250 calories! Have any of you found a big discrepancy between what the Apple Watch gives you with just wrist measurements vs. bluetooth chest strap on other devices? I have yet to try out the bluetooth chest strap and Apple Watch combination. Is there any way to adjust the calorie count? BTW, the distance and time duration were consistent with what I have measured in the past, just the calories were really different.