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:
FILM 7.
PELVIC
MOTION FOR-
WARDS,
WHILE
W A L K I N G
(Sixth Phase).
The right leg is
now in advance
and the exercise
"begins anew.
FILM 8.
PELVIC
MOTION
SIDEWAYS,
W H I L E
WALKING
(Fifth Phase).
Return to initial
position. The
exercise begins
anew.