Understanding the topography of the human body is key to knowing how the system works. Postures that include bending and unbending of knees enhance flow of synovial fluids to help lubricate knee joints. Chest openers enhance lung capacity and improve airflow. Stretches that apply pressure to the lower abdomen aid digestion, regulate bowel movement, and maintain healthy functioning of regional glands and organs. Upper body inversions help re-activate thyroid, liver, pancreatic function, while simultaneously refreshing pineal and pituitary glands.