These inages dated 1964 shows high school boys, taking time from theire academic endeavors to spend some time enjoying push-ups in their physical education class.
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Having posted numerous images relating to proper attire for PE class, perhaps it is time to start posting more images of PE class activities. This image appears to be middle school or junior high school students getting a little exercise by running in place. The athletic field certinly doesn't appear to be well manicured. They don't appear to be working that hard as none of them are raising their legs to knee level which is often considered proper calisthenic form.