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:
MAJOR
PELVIC
ROTATION :
RECUMBENT,
WITH RAISED
KNEES (Sixth
Phase).
The pelvis has
reached the
highest point of
its orbit as in the
first phase. The
exercise con-
tinues, as in the
phases from 2
to 6.