HAMSs of men doing callisthenics on gym floor, of men doing push ups. MS of men sitting in circle on gym floor, man in centre being rolled around on the hands. MS of trainees doing somersaults past camera, other men lining up for their turn in background. MSs of three men shinnying up thick ropes hanging down from ceiling, of men slinding down ropes, standing at attention in front of instructor. FOLLOW CS of one man climbing up rope. MS of trainees practicing parachute jumping in gym. Shots of instructor showing trainee proprer way of falling on ground, of instructor supervising men as they practice falls in gym.