The kipping pull up is effective because it transfers the initial work of the pull up to the rest of the body, but those forces still have to go through the bar and the shoulder during the arch of the swing. The shoulders then store force like a spring and transfer it back into the bar and the body for upward momentum.

What is the purpose of Kipping Pull-Ups?

A kipping pull-up is when you use a leg swing and hip snap to propel the body upward, helping you get your chin over the bar. It drastically decreases the force production required of the arms to get up to the bar.

Why was it so strict before Kipping?

Why are strict reps important? Being able to do them ensures that your shoulders have the strength base necessary to support kipping pull-ups. Since there is no momentum involved, you are relying on your shoulder muscles to move the load (in this case, you) versus the inertia you create by kipping.