Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].

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LEG ROTA- T I O N IN HANDS-AND- KNEES ATTI- TUDE (End of Sixth Phase). The right leg has reached the maximum point of its circular outward move- ment and the tip of the toes is at furthest from the floor. The leg is pointed straight away from the spectator and is, therefore, much fore - shortened in perspective. It ^ • FILM 2. PELVIC ROTA- T I 0 N IN THE HANDS- AND-KNEES ATTITUDE (End of Fourth Phase). The right hip rests on the ground. The knees remain stationary in the original position. - FILM 3. VERTICAL PELVIC ROTA- T I O N ON HANDS AND KNEES. " The Machine" Exercise (Fourth Phase). The lumbar vertebra? have reached their maximum arch upwards and the abdomen its extreme ten- sion.