sentence: A group of men are inside of a gym space stepping on aerobic steppers at a fast pace. sentence:  They look to be having a great time and begin reaching out with their arms and varying their workout. sentence:  They continue on performing another series of similar workout with their steppers. sentence:  They move side to side, alternating their movements to a specific rhythm. sentence:  Their last of their workouts seem to be a compilation of everything they have been doing thus far and they are varying their movements within it.