Hi IriaCarr,
Thanks for your post! We understand that if you do not start a workout on your Apple Watch, it will not record the expected amount of calories burned. If you do not start a workout, your Apple Watch will not be continuously monitoring your vitals, as it would if you had started a workout on your watch. Your Apple Watch can detect if you are exercising for certain workouts.
In watchOS 5 or later, when your Apple Watch senses that you’re working out, it taps you on the wrist and asks. Tap an option within the notification to record the workout, change the workout type, mute notifications for the day, or dismiss the notification. No matter when you tap, you’ll get all your workout credit from the time you started exercising.

How long it takes for your watch to alert you to record a workout varies by workout type. Here are the workouts that your watch can give you reminders for:
- Indoor Walk
- Outdoor Walk
- Indoor Run
- Outdoor Run
- Elliptical
- Rower
- Pool Swim
- Open Water Swim
To turn this setting on or off, open the Settings app on your Apple Watch, tap Workout, then go to Start Workout Reminder. "
For more information, refer to the article below.
Work out with your Apple Watch
Let us know what you find out!
Take care!