KnuckleUp Fitness is more than a gym. Its a family and a movement. Do your friend like martial arts like Muay Thai, kickboxing and Brazilian Jiu Jitsu as much as you do? Do you hand around people who are in to health If you know people that you think would benefit from our unique brand of martial arts and fitness training then you can take part in our Refer a Friend Program. It works like this: If you refer someone to our gym who becomes a member then you will receive one free month of training at Atlanta’s best martial arts academy and fitness gym.