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A high school PE teacher giving 2 students instruction during PE Class wrestling activity. Baggy gym shorts in that era did little to conceal the leg straps of the mandatory jockstraps.
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.