The era same sex male PE classes has long passed, but for some memories remain. Regulation PE uniforms ( gym shorts, gym shirts, white socks, gym shoes and jock straps and at some schools cups were mandatory. ) PE classes meant calisthenics, running laps, more calisthenics and of course thorough group showers. Swimming often was done wearing only smiles. Platoon formations, physical conditioning was intended to prepare all boys for mandatory military service during the draft era.
Group looks too larger for typical physical education class. Taking attendance might be challenging. If they all use the same locker room and showers, it would probably be a bit crowded
