The world of female bodybuilding provides the backdrop for this tale of an aspiring young actress who initially becomes interested in the sport as a means of self-defense following a physical attack by two men, but then finds that while concentrating on building up her body her relationship with her parents, with whom she is living, and her new-found boyfriend, a young cop, is breaking down. Several noted bodybuilders and iron-pumpers, male and female, put in appearances to give this production an added authenticity.

Kerttu is assigned to a gym due to back problems, where it turns out she is a genetic super-talent. Suddenly, she finds herself aiming for an incredible goal: a fitness championship. She is aided by a former genetic prodigy, journeyman bodybuilder Vili, who has lost his purpose in life. The mismatched duo have a lot to learn from each other. Before Kerttu can get into shape for the competition and Vili back on the road to life, both must grow as people and overcome steep prejudices.