The phrase "work out" can mean a variety of different things, and there are many different synonyms that can be used depending on the context. For example, if you are talking about exercising or getting fit, you might use words like "train" or "work on your fitness." If you are talking about figuring out a problem or situation, you might use words like "solve" or "resolve." In a more general sense, you could use words like "manage" or "handle" to refer to work-related tasks or responsibilities. Regardless of the specific context, there are always plenty of different words and phrases you can use to describe the concept of "working out".