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:
PELVIC VER-
SION WHILE
WALKING
(Fourth Phase).
The legs begin to
stretch them -
selves slowl y
again, while the
pelvis is raised
from the sitting
posture and
slowly revolves
towards the
right.