Begin with a dumbell or kettelbell in both hands. Bend the knees, holding the weight between the legs, with the head and chest upright. Rise up, thrusting the hips forward and swinging the weight to eye level. Keep the arms extended and maintain control of the weight through its arch, all the way up and down.
This is an excellent, total body exercise with a strong emphasis on the "posterior chain" of muscles. When done with low/moderate weight at high reps, it is an excellent conditioning movement. When done with heavy weight and low reps, it is an excellent strengthing exercise.
Here are two good links with video that can give you a good idea of what they look like:
http://www.youtube.com/watch?v=sZbfLGtkX1s
http://rosstraining.com/blog/2008/12/31/homemade-t-handle-demonstration/
