Shapes

Shapes is a fitness center chain that Marge Simpson opened. Its purpose is to provide a positive workout environment for ordinary women.

History
When Marge found out she was gaining weight, she looked for a gym to join. After a bad experience at the LA Fitness Center, Marge saw the business space vacated by the Android's Dungeon and turned it into Shapes, a fitness center for regular women. Marge's gym quickly became very popular among the women of Springfield -- the day she opened, there were women lined up around the block waiting to get in. To accomodate all of her customers, Marge opened a second Shapes location in a building that had previously been a Krusty Burger restaurant.

Shapes then became a resounding success, turning into a national chain and making Marge rich and famous.

It's unknown what became of Shapes as it is never mentioned again and Marge is never shown doing anything related to it. It is possible that Marge sold the chain, or is now just earning money while other people work for her.

Behind the Laughter
Shapes is a parody of Curves, an international fitness franchise whose facilities are specifically designed for and focused on women.