Gym

Okay so im 13m I wanna go to the gym I wouldn't say im fat but I wanna try to get abs and muscles and shit bit only for looks but because its good for me but I always procrastinate it because I don't like working out at home I wanna go to a gym but gym passes are a lot of money and my mom says its to much ive been doing a "job" where I mow lawns and stuff so idk if i wanna talk to my mom and ask if I can use that money for a gym pass or what im just stuck and don't know what to do