I don't think this is about telling your titles to others but adjusting your self identification to align with your aspired values.
It helps you be consistent.
For example, at some point I went from "guy who happens to do yoga" to a "yoga guy." At that time, what would I do when landing in a new city? Look up a yoga studio. Because I was a yoga guy. A guy who happens to do yoga wouldn't necessarily do it.
It's not about asserting who you are to others it's about facilitating your own decisions to be what you want. "a guy who's trying to be more active" may still eat a whole cheesecake. An "athlete" would not.
It helps you be consistent.
For example, at some point I went from "guy who happens to do yoga" to a "yoga guy." At that time, what would I do when landing in a new city? Look up a yoga studio. Because I was a yoga guy. A guy who happens to do yoga wouldn't necessarily do it.
It's not about asserting who you are to others it's about facilitating your own decisions to be what you want. "a guy who's trying to be more active" may still eat a whole cheesecake. An "athlete" would not.