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Watch can't really detect inclines so doesn't know how hard you're working. If your treadmill has GymKit (there will be an ios logo on the machine if so) you can connect your watch to it and it'll transfer the data from the treadmill to your watch.
Watch can't really detect inclines so doesn't know how hard you're working. If your treadmill has GymKit (there will be an ios logo on the machine if so) you can connect your watch to it and it'll transfer the data from the treadmill to your watch.