To remove podcasts from your Apple Watch, follow these steps:

1. Open the Watch app on your iPhone.
2. Tap 'My Watch' at the bottom of the screen.
3. Scroll down and tap 'Podcasts'.
4. Under 'Add Episodes From', tap 'Custom'.
5. Under 'Shows', you will see a list of all the podcasts you are subscribed to.
6. Tap on the podcast you want to remove from your Apple Watch.
7. Switch off the toggle next to 'Add to Library'.
8. Repeat steps 6 and 7 for any other podcasts you want to remove.

This will stop new episodes from automatically syncing to your Apple Watch. To remove any existing episodes, you'll need to do that manually:

1. On your Apple Watch, open the Podcasts app.
2. Find the episode you want to remove and swipe left on it.
3. Tap the red 'X' button to delete it.

Remember, removing podcasts from your Apple Watch won't delete them from your iPhone.