Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
287/426

- (canvas 288)
The image contains the following text:
1
FILM 6.
PELVIC
MOTION,
BACKWARDS
AND FOR-
WARDS, IN
THE KNEE-
HEEL POSI-
TION, WITH
KNEES APART
{Seventh Phase).
The pelvis is
gradually drop-
ped between the
thighs on the
floor.