Apple Watch is a great product, but they are misleading people on the accuracy of the "indoor run" feature. Notice that when you first do an "indoor run" on a fresh watch, the watch informs you that you need to run outdoors first for a while for calibration. During calibration they are trying to get an idea of your stride length. When you run outdoors, the watch knows exactly how far you ran (thanks to GPS) and how many strides you took, so they know your average stride length. Then they apply that to your indoor runs. This might work for some runners, but for elite runners like myself, I try to keep the same stride length no matter the pace (180 strides per minute normally whether running 5 min pace or 7 min pace).. Apple Watch fails miserably to produce accurate results. Just yesterday I was varying my stride intentionally to make some adjustments... Apple Watch was off by 15%+. Apple, you need to remove the "indoor run" feature or inform your users that it's not accurate. It's a blight on an otherwise great product.