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

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MAJOR PELVIC ROTATION: RECUMBENT, WITH RAISED KNEES (Fourth Phase). The pelvis de- scribes a semi- circle above the floor from right to left. FILM 6. PELVIC MOTION, BACKWARDS AND FOR- WARDS, IN THE KNEE- HEEL POSI- TION, WITH KNEESAPART (Fifth Phase). The pelvis is drawn back- wards moving from the but- tocks.