A young man is standing in an open doorway with his hands over his head palms facing towards him on a bar secured at the top of the doorway.   The young man lifts himself up and places his feet in the gap between the bar and the top of the door frame.   The young man lowers his body, extending himself the full length of the doorway, hands behind his head, elbows out.   The young man does two sit ups.   The camera shows the top of the doorway focusing on the bar and the young man's feet secured at the top of the doorway.   The camera returns to the full view of the young man doing sit ups in the doorway.   The young man does three more sit ups.