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
(H ORIZON-
TAL) [Eighth
Phase).
The pelvis has
returned to the
initia position.
The exercise
begins anew.
FILM 11.
PELVIC VER-
SION WHILE
WALKING
(Eighth Phase).
The thighs and
knees are thrust
more forward
and the pelvis
moves more to
the right.