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
(Third Phase).
The pelvis is now
turned as far as-
possible from
right to left.
The arms are in a
line with the
knees which are
bent.