Pull ups and chin ups are a great body weight exercise, and is a great way to workout your back, biceps, triceps, and chest. However, they are an intimidating and take a lot of energy to do them, I know from experience. I've thrown up twice exercising (gross!), and both times the routine that day included pull/chin ups.
If you can't do many pull/chin ups, or none at all, don't worry. I did a google search about pull/chin ups, the military says male recruits need to do only 3, and females are not required to do them.
If you want to include pull/chin ups in your routine, or already have them in your routine, and are having problems doing them, here's a great tip. If you have workout bands, they can be used to help perform pull/chin ups. Just hang the band on the bar, put your foot in the handles, and perform your pull/chin ups. It helps with full range of motion, you can straighten your arms at the bottom of the pull/chin up, and pull yourself back to the top easier.
Once you master pull/chin ups with bands, you can stop using the band and perform a full pull/chin up without them.
