If you use an Apple Watch when you exercise, you're likely recording your workouts on it. As some users have noticed, there can sometimes be a bit of a disparity between measured pace depending on your workout.
For instance, your Watch might record a much slower pace on a treadmill indoors compared to when you run outside, even if your pace and distance are very similar (or vice versa). This is down to not being able to use GPS to calibrate your speed, instead having to rely on the watch's internal gyroscope.
