Use the Quick button on the Galaxy Watch8 Classic and Watch Ultra

To program the Quick button directly on the watch:

1. Navigate to Settings.
2. Scroll to and tap Buttons and gestures. 
3. Tap Action.
4. To choose an exercise or workout, tap the Settings icon next to Samsung Health. 
5. Select from the list, and then scroll to the bottom and tap OK. 
6. If you'd rather select a feature instead of an exercise, scroll below Samsung Health and select from the list.
7. Navigate back to Buttons and gestures, and then tap Start action with. 
8. Tap either Short press or Double press. 

1. Open the Galaxy Wearable app on your connected phone.
2. With the Watch Ultra or Watch8 Classic selected, tap Watch settings.
3. Tap Buttons and gestures.
4. At the top, you'll see a Quick button section. First, tap Action.
5. Samsung Health is selected by default. To select what it does within Samsung health, tap the Settings icon on the right. 
6. From the list shown, tap the exercise you want the button to launch, and then tap OK.
7. If you don't want to launch an exercise, choose from the Features list instead. You can also choose to set it to None to avoid accidental taps.
8. Now navigate back to Buttons and gestures, and tap Start action with.
9. Choose either short press or double press.