Yesterday I decided to change my workout a little on the assisted pull up machine. I'm now doing 3 sets of 7 reps at 35 pound resistance. For those unfamiliar with the assisted pull up machine, the more weight you add on to it, the less body weight you are lifting. With me being 123 pounds, I was lifting 88 pounds (a little of 70% of my body weight). I've just got to remember that this is about endurance and not so much strength. I'm going to work up to 15 reps (semi comfortably) before I lower the weight to 25 pounds.
I'm on the road to 5 pull ups.