by Andy Sloey:

So you want to start your very own improv team - the first question is usually "Who's gonna be on it?" The answer is deceptively simple - the best people to have on your team are those who you find interesting. People who make you laugh.  People who you genuinely enjoy being around.  Your friends! 

Improv is built on play, and just like in childhood, we're best suited playing with our friends. Don't have any friends in your local improv community?  Make some!  Take a class...