Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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(8) Backward and Forward Pelvic Motion, in the knee-heel position (basic position from Fig. 3). (a) Kneel-heel Squatting Position.—Then lift the pelvis slowly forward until the trunk is quite extended. Be careful, in this slow steady forward movement, to keep the hips well forward. Then slowly move backwards till the nates are again over the heels, while the trunk remains upright. If the trunk is thrust forward at all in this latter stage of the exercise, its use and purpose are completely spoilt. (b) The same initial position : Kneel-heel Squatting.— Begin the same forward pelvic movement as in 8 (a), but only about half-way ; then dip back again, into the kneel- heel position. Carry out this dipping and bobbing movement several times in succession, fairly quickly. The backward movement, if sufficiently quick and elastic, will help to give the same quality to the forward lift; it becomes more a quick rhythmic spring. (c) Kneel-heel Squatting, with Knees apart (Film 6).—Lift the pelvis forward, moving from the groin, with the trunk so far as possible erect. Then backwards again, slowly as in (a). But do not come to rest upon the heels but between them, so that the thighs are enclosed between the shins or lower legs. Practise on a mattress at first. (d) Kneel-heel Squatting with Knees apart.—Proceed as in (c), but move forward only half-way and then drop back- wards again with a quick elastic spring, and as rapid recovery and forward spring again (see 8 (b)). Repeat several times. (9) Pelvic Flicking or Flipping in the Knee-heel Position (not illustrated). Squat back on the heels and separate the knees. At the beginning of this exercise, the pelvis is between the heels, as in 8 (c). Draw the pelvis forwards so far as possible, but do not stretch the trunk to its full extent. Then flick or jerk the pelvis rapidly forward and then backwards, without sitting. The pelvis must jerk rapidly to and fro without being supported by the heels or on the couch or floor. This exercise requires a specially rapid alternation of contraction and