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:
MAJOR
PELVIC
ROTATION
(HORIZON-
TAL) {Sixth
Phase).
The pelvis is as
far as possible to
the left.
FILM 11.
PELVIC VER-
SION WHILE
WALKING
(Seventh Phase).
The feet are
drawn upwards,
resting the
weight on the
ball of the soles.
The pelvis begins
to turn from left
to right.