Open 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, gender, 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 on your Apple Watch.
Tap Workout, then turn on Running Auto Pause.
Your Apple Watch automatically pauses and resumes your outdoor running workout—for example, if you stop to cross the street or get a drink of water.
For many workouts, your Apple Watch senses when you’re moving and alerts you to start the Workout app. It even gives you credit for the exercise you’ve already done. It will also remind you to end your workout, in case you get distracted when you’re cooling down. Follow these steps to turn workout reminders on or off.
Open the Settings app Get the most accurate measurements using your Apple Watch.