sentence: A shirtless man briefly lifts a ball up onto one shoulder. sentence:  Another shirtless man lifts weights on a barbell repeatedly with others exercising in the background. sentence:  A third man lifts and flips a heavy tire while two others watch in the background. sentence:  A number of individuals are shown in a parking lot with cars exercising with weights, kegs, or tires, while others watch. sentence:  A series of tug of war matches are shown with spectators in the background.