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 ROT-A- T I O N IN HANDS-AND- KNEES ATTI- TUDE (End of Second Phase). The left leg has reached the maximum point of its circular outward move- ment and the tip of the toes is at its furthest from the floor. The leg is pointed straight at the spectator and is, therefore, much foreshortened in perspective.