Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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The image contains the following text:
M A J O R
PELVIC
ROTATION
(HORIZON-
TAL) {Third
Phase).
The pelvis con-
tinues the cir-
cular movement
forwards. The
muscles of the
groin are drawn