Pull-ups and chin-ups are both great strength-building bodyweight exercises, but they're not the same exercise. People tend to use them interchangeably, but the differences are distinct enough that you should avoid lumping them together.
Tagged With chin ups
I've been doing that pull-up program we posted two weeks ago, and guess what? It works. At the beginning, I could do about half a pull-up, and now I can get my nose up to the bar. I also more than doubled the amount of time I can hang from the bar with my arms flexed. Here's how I did it.