Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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1 FILM 6. PELVIC MOTION, BACKWARDS AND FOR- WARDS, IN THE KNEE- HEEL POSI- TION, WITH KNEES APART {Seventh Phase). The pelvis is gradually drop- ped between the thighs on the floor.