Are Women-Only Gyms Guilty of Discrimination?
https://fitnessmarketing.com/2011/04/are-women-only-gyms-guilty-of-discrimination/

Curves
Curves International, Inc. is the largest chain of fitness centers for women in the world. We are famous for our 30-minute circuit that works every major muscle group with strength training, cardio, and stretching and always has a coach to help members with proper form, answer questions, and offer encouragement.
https://www.curves.com/about-curves