The Simpsons (1989)

S19E7 Husbands and Knives

Marge decides to start her own gym catering to real women after growing tired of the pretentious atmosphere at Springfield's L.A. Body Works. She opens Shapes: A Gym for Women, which quickly thrives and leads to a successful chain, bringing her wealth and fame. However, Homer becomes anxious that Marge might leave him for a more attractive partner, prompting him to take drastic measures to protect their marriage.