Wrist Raise Settings
Your Apple Watch will either turn on its display or brighten its display when you raise you wrist (depending on which model you have). This is basic functionality, but you can actually customize what happens when you raise your wrist.
Some users prefer seeing the watch face when they raise their wrist, while others want to see their last used app. You can edit these types of settings in the iOS Watch app by going to General > Wake Screen. There’s also the option to activate Siri when you raise your wrist, which you can edit in Siri > Raise to Speak.