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Canadian Improv Games
If you have or want to start an improvisation group at your school this would be an amazing opportunity for you to check out. Open only to schools in Canada, the Canadian Improv Games is a friendly competition where high school students...
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Learn Improv
This site is a place to learn about the art of improvisational comedy. "One cannot really learn improvisational comedy from a web page, however the list of exercises included here will definitely help."