Snowboard

From CaseyPedia

A snowboard is a small wooden board that one can stand on to descend any sufficiently steep snowy hill. True to Casey Serin's nickname of Snowflake, snowboarding is one of a few physical activities that he seems to enjoy. Of course, the fact that snowboarding costs money, something Serin doesn't have, does not stop him from participating. For his most recent snowboarding trip, Serin allegedly had a friend "treat" him in exchange for Serin's ever-present vague descriptor -- "technical work".

Snowboarding is generally a decent cardiovascular exercise. The only other real physical activity engaged in by Serin is bouncing, both on his Blue Ball and his trampoline and the Monkey dance.