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) (Fifth
Phase).
The pelvis moves
sideways to the
left and back-
wards.
FILM 11.
PELVIC VER-
SION WHILE
WALKING
{Fifth Phase).
The left leg is
almost straight,
the right leg is
drawn forwards,
the pelvis has
not quite re-
verted to its
normal posture.