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:
LEG ROTA-
TION ON
HANDS A N 11
KNEES {Begin-
ning of Seventh
Phase).
The right leg
begins its return
movement to the
first attitude.
The lifted hip is
particularly well
shown in this
picture.
FILM 2.
1JELVIC ROTA-
T I O N IN
THE HANDS-
AND-KNEES
ATTITUDE
{Beginning of
Fifth Phase).
The pelvis is
drawn back-
wards again.