In life, the best things for us are usually things we don't like: eating broccoli, flossing your teeth, and perhaps everyone's least-favorite exercise — pull-ups. People loathe this mighty move, which is unfortunate because the pull-up is not just a fantastic exercise for increasing the size and strength of your back and arms, it's also a posture-improving move that improves your overall athletic ability. Many people complain that chin-ups and pull-ups are too hard - they can only do a few reps, if any at all. It seems impossible to make progress, much less rifle off sets of multiple reps. But if you try the following progression, in a few weeks you'll be doing just that.
Before you can do a pull up, you must be able to do a chin-up. If you can perform only a few or none at all, don't get frustrated. Get fascinated. Most people can't perform many chins, so you are not alone. Use the following 4-week program, performing two workouts per week, and you'll increase your reps in no time.