I'm having calorie burn issues with my galaxy watch also. It seems that my galaxy watch does not accurately calculate calories. We all know that the calorie burn calculated via the watch is just an estimate however it seems that the Samsung watch either grossly underestimates or grossly over estimates calories burned. I'm a very active individual and I work out intensely on a daily basis. I'm 5'9, 200lbs. I did an elliptical workout at 5 mph, on resistance level 12, for 30 minutes with an average heart rate of 160 during the excercise and barely burned 300 calories. The machine calculated that I burned over 600 calories and my Fitbit used to calculate a little over 500 calories when I worked out at the same intensity. When I use the stair climber, on level 12, for 30 minutes averaging the same heart rate, I barely burn 200 calories. We all know the stair climber is a very intense workout. However, if I sit in the sauna and do some light workouts for 30 minutes, averaging a heart rate of 120, I burn almost the same amount of calories as my intense stairclimber workout. It seems like the watch is not accurately incorporating the intensity of the workout via heart rate zones. This should be a simple fix, however this has been on going for years now and it seems that Samsung doesn't care to fix it. I like my galaxy watch but it's unreliable when it comes to accurately estimating the calorie burn of workouts which is important to me.