Lately ive become really good at chin-ups smashing 3sets of 10 easily. I found this thing that you wrap around yourself and can hold weights on it to make the chin-ups harder. I dont do many upper back exercises, well really only chin-ups and bb rows, but im looking to get a big upper back. Has any1 had good gains from doing weighted chin-ups by adding more weight all the time to them? heres the thing - http://www.bodybuilding.com/store/griz/grizfbelt.html