Breathing is important in the Pilates method. In Return to Life, Pilates devotes a section of his introduction specifically to breathing “bodily house-cleaning with blood circulation“. He saw considerable value in increasing the intake of oxygen and the circulation of this oxygenated blood to every part of the body. This he saw as cleansing and invigorating. Proper full inhalation and complete exhalation were key to this. He advised people to squeeze out the lungs as they would wring a wet towel dry. In Pilates exercises, the practitioner breathes out with the effort and in on the return. In order to keep the lower abdominals close to the spine; the breathing needs to be directed laterally, into the lower rib cage. Pilates breathing is described as a posterior lateral breathing, meaning that the practitioner is instructed to breathe deep into the back and sides of his or her rib cage. When practitioners exhale, they are instructed to note the engagement of their deep abdominal and pelvic floor muscles and maintain this engagement as they inhale. Pilates attempts to properly coordinate this breathing practice with movement, including breathing instructions with every exercise.