GTA SA: Ganton Gym The Ganton Gym is a gymnasium featured in Grand Theft Auto: San Andreas. Located in Ganton, Los Santos, the gym becomes accessible following a phone call from Sweet after the mission Drive-Thru. Carl Johnson can learn boxing moves at the gym, as well as use the other facilities to increase or decrease certain statistics, specifically stamina, muscle and fat. Inside, there is a boxer punching a bag, who serves as the boxing trainer, and there are two other boxers training with