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:
PELVIC VER-
SION WHILE
WALKING
(Ninth Phase).
The knees are
now half - way
bent, the pelvis
has turned as
far as possible to
the left, the arms
are level with the
hnees.