Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It may also help to reset your calibration data and recalibrate your Apple Watch occasionally, being sure to allow the arm on which you are wearing it to swing naturally both during calibration and during subsequent treadmill-based workouts.
Source: https://www.devicemag.com/apple-watch-treadmill-accuracy/