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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>.

A 1928 photogravure of an <n>Abyssinian Sage</n> by <n>Karl Blossfeldt</n> from his book <n>Urformen der Kunst</n>.

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

A photograph from the series <n>Art Forms in Nature</n> (1928) by photographer <n>Karl Blossfeldt</n>.

A 1928 photogravure by <n>Karl Blossfeldt</n> from his book <n>Urformen der Kunst</n> (Art Forms in Nature).

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