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:
SQUATTING
OR CROUCH-
ING SWING
{Fourth Phase).
The pelvis
touches the
floor.
FILM 6.
PELVIC
MOTION,
BACKWARDS
AND FOR-
WARDS, IN
THE KNEE-
HEEL POSI-
TION, WITH
KNEESAPART
(Sixth Phase).
The lumbar ver-
tebra? are arched
outwards and
the abdominal
muscles drawn
tense.