Maverick director Tony Kaye delivers a raucous, adrenaline-fueled comedy following Jack Flex, a delusional muscle-bound "creative genius" who maniacally pursues his dreams by selling a dangerous fitness gadget on TV. Given one week to prove his made-up credentials as a Hollywood trainer with celebrity endorsements, Jack spirals through a series of increasingly absurd situations across Los Angeles in this frenetic visual spectacle of ambition and delusion.