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 (HORIZON- TAL) (Fifth Phase). The pelvis moves sideways to the left and back- wards. FILM 11. PELVIC VER- SION WHILE WALKING {Fifth Phase). The left leg is almost straight, the right leg is drawn forwards, the pelvis has not quite re- verted to its normal posture.