(1) A set is the lift action for aerial and somersaulting skills. The arms move quickly in an upward direction, then are stopped quickly and locked tightly in relation to the body, transferring the momentum to the salt or aerial skill. For example, the set for a back tuck occurs when the gymnast leaves the floor stretching their arms towards the ceiling, lifting their chest, and spotting the wall in front of them. (2) A set is a number of reps done without stopping. Usually referring to strength training, weightlifting or conditioning exercises.