Try to connect with your mobile phone, otherwise you will lack GPS positioning and the movement distance data will be inaccurate.
My watch > general > wrist detection must be turned on (default).
My Watch > Health, the data of birthday, gender, height and weight should be accurate.
My watch > General > During exercise and fitness, the heart rate and fitness tracking function should be turned on.
During my watch > fitness activities, all switches should be fully opened as far as possible.
Most likely, the reason why health activities do not turn is that the above settings 2, 4 and 5 are partially or completely turned off.