Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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FILM 7. PELVIC MOTION FOR- WARDS, WHILE W A L K I N G (Sixth Phase). The right leg is now in advance and the exercise "begins anew. FILM 8. PELVIC MOTION SIDEWAYS, W H I L E WALKING (Fifth Phase). Return to initial position. The exercise begins anew.