I ran 5 k this morning on the treadmill in 33 minutes. At least my watch says so . The treadmill display said 4.04k which is way off. There is little way of knowing which device is the correct or at least more accurate. However if i was outside id be tracked by GPS which would e a lot more accurate . Never mind stride and pace. Distance covered wouldn't be disputed. So bare that in mind when running indoor. Just enjoy your time .