Dave Tate from
www.elitefts.com.
Here is how he says to perform them:
"The pull through is one of the best movements to use to bring up the glutes, hips and hamstrings. The muscles of the posterior chain are the most important when it comes to squatting and deadlifting.
To do this movement you will need a low pulley unit (a band will also work). Stand facing away from the machine with the cable between your legs using a medium to wide stance. Begin by letting the cable pull your torso through your legs. Then flex back to the starting position making sure to squeeze your glutes as you rise."
definitely a different way than what's shown in the book