I just got an Apple Watch series 1, my first apple watch. I went to the gym and just did a simple treadmill workout. When the treadmill said I had reached one mile, I glanced down at my apple watch, which I had set for an indoor workout. It said my distance was only 0.49 of a mile -- so less than half of what the treadmill reported. Is there a way to correct this? I did a quick google search, and one of the recommendations is to reset the calibration data. I'm just confused because the difference in the treadmill and watch distance was over half of a mile. Should I just reset the calibration data, or does anyone have any other suggestions? Thanks.