Stand with thelegs apart, holding a stick across the trapezius above the posterior deltoid, hands resting on the stick with out pushing:
- Rotate the torso to one side and to the other, keeping the pelvis fixed with isometric contraction of the glueteal muscle.
When the right shoulder is forward, this exercise works the right external oblique and, deep in, the left internal oblique and, to a lesser degree, the rectus abdominis, quadratus lumborum, and the extensor muscles of the spine on the left side.
To increase the intensity, round the back slightly.
You can also perform the movement while seated, which helps fix the pelvis so that you can focus the effort on the abdominal core.
Best results are obtained with sets lasting several minutes.
