Sidekicks (1992)

Asthmatic teenager Barry Gabrewski is a daydreamer. Troubled by bullying, he escapes into a fantasy world where he is the sidekick to his martial arts hero, Chuck Norris, in a series of high-octane adventures taken right out of his movies. With help from his teacher's wise old uncle, Mr. Lee, Barry learns the finer points of martial arts and enters a karate championship.