It means to "determine" or "create" a routine. Example: If you want to increase your muscle mass, you need to work out a routine at the gym that will focus on muscle development.

I think English is a language that more than depends on the subject. The meaning of a sentence changes according to its subject.

In this instance, "work out" means "figure out", "brainstorm", "plan", "put together". In Robson example, They decided to go to some comedy clubs and "work out a routine", the phrase in quotes means - they decided to create a stand up comedy routine and try it out. Note, this phrase is rather awkward, especially since "work out" typically means to exercise, such as lifting weights at a gym, for which you can also have a routine.

Tks ! I saw in other context. Is It the same meaning? ex: ..They decided to go to some comedy clubs and "work out a routine".