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 ON HANDS AND KNEES (Begin- ning of Fourth Phase). The left leg is drawn slowly up to the body from the hip joint. FILM 2. PELVIC ROTA- T I O N IN THE HANDS- AND-KNEES ATTITUDE (Beginning of Third Phase). The pelvis is drawn forwards.