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
(HORIZON-
TAL) (Fourth
Phase).
The pelvis is as
far as possible
forwards.
FILM 12.
SUSPENSION-
FLEXION
[Fourth Phase).
The woman has
now raised her
legs high enough
to enable her to
let go of the
table edges with-
out risk of slip-
ping off.