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.

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.

Hanging knee lifts and hanging leg lifts are an excellent abdominal workout that can be performed with your doorway pull up bar. Watch the following video as Danielle demonstrates and explains the benefits.

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.

We all know how difficult pull ups can be for beginners. Getting even one pull up can be an accomplishment. Additional reps come with the additional strength you gain from your workouts. A great way to start training your muscles to do natural, unassisted pull ups is to start off doing jumping pull ups. With a jumping pull up, you use the upward momentum of your jump to assist your muscles in getting your chin above the bar. The key is to let yourself down slowly, and make your muscles work on the way down.

Watch the following video, as Danielle demonstrates doing jumping pull ups, and turning them into negatives.

Here is part 2 of the Assisted Pull Ups for Beginners video segment. Danielle shows you a little more advanced method to help beginners gain the strength they need to complete unassisted pull ups.

In this fourth video of the series, Danielle demonstrates assisted pull ups for beginners. Everyone knows how difficult pull ups can be to do. Pull ups are a very beneficial exercise, but they take a fair amount of upper body strength. Danielle shows you some tips for beginners that will help them gain upper body strength on their way to doing pull ups on their own.

Hanging a P90X Pull Up Bar on your door frame is simple. Danielle demonstrates this in the second video of the instructional series. This pull up bar will fit up to a 32" door frame and trim is required. See the video below.

Here is the first video in a series of instructional fitness videos by personal trainer Danielle. This initial video talks about doorway pullup bars, and the benefits to be gained by using them. Subsequent videos will contain demonstrations, tips, and techniques on developing upper body and core strength and definition.