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:
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FILM 1.
LEG ROTA -
T I O N IN
HANDS-AND-
KNEES ATTI-
TUDE {Begin-
ning of Sixth
Phase).
The right leg is
rotated slowly
outwards as the
hip joint is
raised.
FILM 2.
PELVIC ROTA-
T I O N IN
THE HANDS-
AND-KNEES
ATTITUDE
(Beginning of
Fourth Phase).
The pelvis is
drawn down-
wards and to the
right.