Hip Twister:

Consists of a swivel stand which rotates as the arms and shoulders are held square in the overhead holds.

Standing with the spine straight, rotate slowly to the stretch position, alternating directions. While rotating right, the left internal and external obliques are stretched, and to a lesser extent, the abdominal and extensor muscles. Reversing direction works the same muscles on the other side.

This is not a power exercise, so it might take several minutes of easy repetitions to achieve the best results.

Installation Drawing (pdf)