Does anyone do pullups with added resistance? I just started incorporating added resistance to my pullups to increase the intensity, overall strength and improve the amount of reps I can do. Normally I can do 5 sets of 10-15 reps without added weight, but I'm throwing in sets with a 25 pound plate and a 45 pound plate. I weigh about 225 and can do 2 sets of the 25 pound plate for 8-10, and a set with the 45 for about 5-6 good reps. I'd like to be able to hit the 45 pound plate for about 3-4 sets of 10-12 reps. Thoughts on adding resistance?