What are some things you do that helps build your confidence?

What are some things you do that helps build your confidence? Apart from exercising/working out, how do you appear confident? A little trick that helps me, is when I know I'm going to talk to someone "important" that day (like a crush, or an interviewer), I make sure to talk to at least a couple people before. They have to be strangers, or people I don't know too well, they cannot be close friends. This kinda "releases" the anxiety out of me and often, these interactions often go well and they remind me that there's very little to be nervous about.