Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
278/426

- (canvas 279)

The image contains the following text:

LEG ROTA- T I O N O N HANDS AND KNEES [Begin- ning of Third Phase). The left leg begins its return movement to first attitude. It appears less foreshortened, that is, longer.