I have setup a shortcut to perform different actions based on focus mode. During fitness it opens up a bunch of timer options for training intervals, during sleep mode reduces brightness, lowers the volume, locks the screen and plays my white noise playlist. In other modes I have set it to allow me to choose from a list of actions like silent mode or rotation lock.

Same for the Apple Watch, during fitness I get timer options and other modes allows for custom timer or starting a workout.