It doesn't matter that you will be discriminated against by your sister. When you go to the gym, it means you have to lose weight. There are only three kinds of people who go there. The first one likes fitness and wants to keep fit. The second is to hook up with people and have sex. After all, most people don't spend money to go to the gym for fitness, so they basically go to people with acceptable economic conditions, and the third type is fat people who want to lose weight.