I think something that goes against their personality. Someone who hates the spotlight give an improv class, someone who’s afraid of heights a rock climbing class, for picky eaters a food tasting, I hate listening to instructions so I hate yoga so if you got me a yoga class. Even better if you go with them so they can’t back out. It’s easy to say I wanted to get you out of your shell and thought you would like it if you tried it.