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The <n>Legs Akimbo exercise</n> from the 1917 book <n>Physical Training for Business Men</n>. Photo by <n>A. B. Phelan</n>.

<n>Shoulder Straightening with Towel</n> from the 1917 book <n>Physical Training for Business Men</n> by <n>H. Irving Hancock</n>.

<n>The Anatomical Angel</n>, an anatomical illustration from 1746 by artist <n>Jacques-Fabien Gautier d'Agoty</n>.

A photograph by <n>A. B. Phelan</n> from the 1917 book <n>Physical Training for Business Men</n> by <n>H. Irving Hancock</n>.

A chronophotograph from <n>Physical Training for Business Men</n> (1917) by <n>H. Irving Hancock</n>. Photo by <n>A. B. Phelan</n>.