Pull ups are very beneficial, but you should take into account the following safety reminders in order to avoid injury.

1. Do Not swing or bounce when using your pull up bar.
2. Do Not attempt to hang by your feet or legs from your pull up bar.
3. Do Not use a doorway pull up bar if you weigh over 300 lbs.  Try a pull up station instead.
4. Do Not use a doorway pull up bar if you are unsure about the stability of the doorway or door jamb.
5. Do Not allow children under 18 years of age to use a doorway pull up bar unless supervised by an adult.
6. Ensure that you test to make sure your pull up bar is completely secure in the doorway before using it.
7. Make sure you maintain a controlled motion when performing pull ups or chin ups.

Pull ups and chin ups are great at-home exercises, but you need to take these precautions to ensure that you avoid injury.  Now get back to your workout and add some reps!

In this 12th video of the series, fitness instructor Danielle demonstrates how to use your doorway pull up bar for sit ups. By placing your pull up bar at the bottom of the door frame, you can place your toes beneath the bar to ensure you are using proper form for your sit ups. The bar should not lift when doing sit ups. It it does, you are using your leg muscles too much for momentum, and not using your abs effectively.
Danielle explains proper form for sit ups, which is important for avoiding injury, and for maximizing the benefits of your sit ups. This same method can be employed for crunches as well. Ensure that your lower back and shoulder blades are making contact with the ground, and make sure you are using a fluid motion.
Watch the following video as Danielle demonstrates proper form for the most effective sit ups and crunches.

Fitness instructor Danielle demonstrates how to perform push ups using your doorway pull up bar.  It is important to have a variety of exercises in your workout plan to ensure that one muscle group does not get overworked, giving you an unbalanced appearance.  Danielle demonstrates and explains how narrow grip push ups and wide grip push ups will target different muscles giving you the balanced appearance you are after.

Watch the video below:

In the last video segment, Danielle demonstrated how to hanging knee lifts and hanging leg lifts from your doorway pull up bar.  These are very beneficial to your abs.  In the video below, Danielle elaborates on some of the added benefits of this exercise.

In this video, Danielle talks about pull ups and the importance of using proper form. Poor form can result in unwanted injuries. Watch the video for a demonstration.

Protecting your Door Frame

Doorway pull up bars are a very convenient piece of exercise equipment to own. They are portable, and can be set up in seconds, and removed in seconds once your workout is complete. Then they can easily be stored in a closet or under a bed until your next workout.

Most of the vendors of doorway pull up bars claim that they will not do any damage to your door frame. This is true for the most part. But ... with extended use over time, I can see how the door frame could become dented or dimpled at the point where the bar rests on the frame.

I'm in a newly-built home, and the last thing I want to do is give my wife a reason to get angry with me. So I recommend adding a little extra protection or padding in between the door frame and the bar. I use a couple of old rags, as pictured above. These add enough extra padding to ensure that the door frame is protected, and it won't adversely affect your workout.