Go to the Apple Watch app on your iPhone.
Tap My Watch, go to Health > Health Details, then tap Edit.
Tap Height or Weight, then adjust.
Your Apple Watch uses the information you provide about your height, weight, sex, age, and wheelchair status to calculate how many calories you burn, how far you travel, and other data. The more you run with the Workout app Calibrate your Apple Watch for improved Workout and Activity accuracy.
If you prefer meters to yards or kilojoules to calories, you can change the measurement units the Workout app uses.
Open the Settings app on your Apple Watch.
Tap Workout, then change the Start Workout, Resume Workout, and End Workout reminder settings. (Workout reminders are on by default.)
You can also open the Apple Watch app on your iPhone, tap My Watch, tap Workout, then change the workout reminder settings.
If the exercise you’re doing or the gear you’re wearing causes accidental taps on your Apple Watch, you can turn on the water lock so your workout isn’t interrupted.
Press the Get the most accurate measurements using your Apple Watch.