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-
T I O N ON
HANDS AND
KNEES (Begin-
ning of Fourth
Phase).
The left leg is
drawn slowly up
to the body from
the hip joint.
FILM 2.
PELVIC ROTA-
T I O N IN
THE HANDS-
AND-KNEES
ATTITUDE
(Beginning of
Third Phase).
The pelvis is
drawn forwards.