Muscle Sands Gym is a outdoor gym located on Vespucci Beach and featured in Grand Theft Auto V. One of its sponsors is Pump Buddy Magazine. The gym cannot be used however, sometimes after switching to Franklin, the player will witness him using the gym before being able to control him. The gym was also seen in Grand Theft Auto: San Andreas, as Santa Maria Gym.
Muscle Sands is based off of Muscle Beach, located in Venice Beach, Los Angeles.