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Full free article detailing how to do this Yoga Exercise to awaken Kundalini Shakti and help her rise can be found here - http://anmolmehta.com/blog/2009/08/27/lower-back-exercise-yoga-spinal-twists/.
This exercise is excellent for the lower back and spine. There are several hand positions that can be used for this pose. The one that is best for stimulating Kundalini at the base of the spine is the third variation I have demonstrated in this video.
In that variation the fingers are interlaced and arms are behind you, with the hands pulled away from the lower back. Then one twists which in this position.
In addition to helping with Kundalini Awakening, this exercise is also very good for warming up prior to doing any difficult sets and poses.
You will find many more kundalini awkening yoga exercises and sets for free on AnmolMehta.Com.