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 IN
HANDS-AND-
KNEES ATTI-
TUDE ( End of
Fifth Phase).
The right leg is
at maximum
extension
backwards and
simultaneously
raised as far as
possible off the
ground. In the
illustration, the
leg is shown in
perspective.
FILM 3.
VERTICAL
PELVIC ROTA-
T I O N ON
HANDS AND
KNEES. " The
M a c h i n e "
Exercise (Fifth
Phase).
The pelvis is
drawn back
again to the
level of the heels
and the exercise
begins anew
from the first
phase.