DodgeBall: A True Underdog Story (2004)

Storyline:
When megalomaniacal White Goodman, the owner of a trendy, high-end fitness center, makes a move to take over the struggling local gym run by happy-go-lucky Pete La Fleur, there's only one way for La Fleur to fight back: dodgeball. Aided by a dodgeball guru and Goodman's attorney, La Fleur and his rag-tag team of underdogs launch a knock-down, drag-out battle in which the winner takes all.