Understanding the center line principal is crucuial if you want to build more than just an average level of strength and muscle with calisthenics.
Moving your limbs towards your center line had many advantages. It places more tension on your target muscles so they get bigger and stronger. It helps protect your joints, espeically the shoulder, and it helps to improve flexibility. I’ve also noticed it helps build a lot more functional carry over to sports since most movements such as punching, running and skiing don’t invovle moving the limbs far out to the side.
Check out this video on how I apply the center line principal to pull ups and push ups: