All right, here's the deal. If you're going to do pull throughs, you best stop wasting your time and start doing kettlebell or dumbbell swings. They not only offer a greater range of motion than pull throughs, they're also a total body movement with some hip pop at the top.
When I was first introduced to pull throughs, I was incredibly underwhelmed. To get any sort of effect, the reps had to be pushed very high and the weight was frustratingly limited due to the fact that you can't load the exercise with any more weight than you can get into position with. But I did them anyway, because a lot of strong folks swore by them, and I assumed they must have some magical properties of some kind.
Looking back now, I should've just stuck with the staples: good mornings, glute ham raises, reverse hyperextensions, back raises, and straight leg deadlifts. The kettlebell and dumbbell swing (and the Hungarian Core Blaster) are very good alternatives, though. Not only do you get low back, hamstring, and glute work, but your traps get some healthy stimulation as well. The big problem that I see when people doing swings is they don't do enough good quality reps; their upper backs aren't strong enough to stabilize the downward swing of the weight and they use way too much upper body English.
Yes, I've tried dragging the sled like a pull through for GPP. Not my cup of piss. I believe a sled was designed to be loaded with as much weight as you can handle and pushed or dragged until you vomit all over your favorite shoes. I'm being dramatic and obviously not literal, but you get the point. Doing a pull through with a sled is like feeding animal crackers to a tiger shark — pointless.
5/3/1 FOREVER PRESALE PROGRESS POST COMING SOON. PLEASE HOLD YOUR QUESTIONS. BOOKS ARE STILL BEING MADE AND WE ARE AHEAD OF SCHEDULE.