DALLAS (January 7, 2013)--Downsize Fitness is an exclusive health club, but not in the traditional sense.

Members must be 50 pounds or more overweight to join.

The chain wants its members to feel comfortable while exercising, so there are no mirrors inside and the windows are fogged and even the equipment is designed for heavier people.

Chicago entrepreneur Francis Wisnewski says he started the gym because "I've been overweight my whole life, and I was embarrassed to go to the gym myself."

The first gyms opened in Chicago and Las Vegas in 2011, and expanded to Dallas in 2012.

Gym member Janie Busch said she likes the supportive atmosphere.

Krisanne Hale, a personal trainer in Dallas, is still trying to lose weight. She says that helps members relate.