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

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MAJOR P E L V I C ROTATION: KFXUMBENT WITH RAISED KNEES (First Phase). Raise the pelvis as far as possible from the floor or couch. FILM 6. PELVIC MOTION, BACKWARDS AND FOR- WARDS, IN THE KNEE- HEEL POSI- TION, WITH KNEES APART (Second Phase). Exert the muscles of abdo- men and but - tocks, and lift up- wards the pelvis, moving from the groin.