Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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The image contains the following text:
LEG ROTA-
T I O N O N
HANDS AND
KNEES [Begin-
ning of Third
Phase).
The left leg
begins its return
movement to
first attitude.
It appears less
foreshortened,
that is, longer.