When Penny’s aunt—a legendary aerobics instructor from the neon-lit, spandex-clad 80s—suddenly passes away under bizarre circumstances, Penny and her friends decide to clean out her retro home. But between the leg warmers and workout tapes, they uncover a cursed article of sportswear that brings an ancient evil to life. As the demon starts possessing Penny, her friends find themselves in a high-energy battle that demands exercise and EXORCISM!