In the physical body, that's literally true. Our thoughts and feelings and patterns literally will translate down and play out in the way that our body functions. Power expresses through our voice, our voice box or larynx, our vocal cords, giving us the ability to convert our ideas into the words that we speak. Power also expresses in and through our muscles. When muscles contract, they provide movement for our whole body, and especially for our arms and legs, which give us power in this physical world.
Imagination relates to the third eye and the organ called the thalamus.
This is the place in our physical form where we create new images about ourselves, where we receive new images that come into our mind's eye. Understanding is accomplished by way of our five senses. We gather all of this information and then we analyze it in order to understand ourselves and our place in the world. The power of Will relates to our lungs, our respiratory system, breathing in the will of God, God breathing His or Her will into us to bring us life. It powers our throat, our voice, our speaking of the word, our power center, our throat chakra if you want to put it in Eastern terms.