Spherical body

Imagine you are a ball filling with air inside.

Although your mind determines which part of the ball is to hit, the "air" fills the internal sphere of the the ball in an even manner. When you push forward, your back goes backward; your head pushes upward; your leg goes downward; your right side maintains the force to the right; your left side maintains the force to the left, etc. That's the idea behind the eight directions diagram above.

The force is exercised as a coherent whole: You are in a balanced position.

If the force is directed to one side only, it will piece through the wall of the ball. The "air" is released, and you lose the power: You are in an unbalanced position.