Aloha richard1985,
Breathing of the Universe
As Steve mentions, the energy is coming in from every side of the body, penetrating and lighting up and the cells, organs, fluids, etc. as it goes through to collects in the lower dantian.
"Sickness"
You are changing the extra energy in the body-that is at the wrong place, speed, or time and sending it back into the universe. The balancing that happens in the energetic system is then reflected in the physical. Being in our heart (seeing the healing happening,guiding the energy, allowing Love, Kindness and forgiveness to flow) rather than head (focusing on, fighting against,looking for a concept/illness), the balancing of the various energy systems in the body allows for functions of the body to balance and go back to normal.
As Steve also mentions with his example, the physical systems (organs, glandular, nervous, respiratory, etc.) systems will balance as the underlying energetic systems do so. This can be accomplished with good sleep, food, exercise, attitude, qigong, paraliminals, and supportive environments.
Much Love,
Shawn