In martial arts, it’s important to get a thorough grounding in the basic principles as early in your training as possible. Learning the basics provides a much easier path to learning the more advanced techniques down the road.
In Tomiki aikido (and possibly other styles as well), one of our basic principles involves keeping the arm in the center of your body as much as possible. The “center”, in aikido terminology, refers to the horizontal area from left shoulder to right shoulder and the vertical area from your shoulders to your waist. When doing aikido, we try to keep the hand in this “center” region as much as possible.
This results in movement that is more structurally sound, and it also allows you to use the momentum of your body to more efficiently redirect your opponent’s force. This video demonstrates the “hand in the center” concept.