Classical Pilates teaches consistency in respecting the principles of the method developed by Joseph Pilates. Teachers of Classical Pilates seek to stay close to Joseph Pilates's original work and support the use of equipment that is built to his specifications. Classically trained teachers have studied an important part of the Pilates system of exercises, and continue training towards mastering the whole system over many years. The Pilates method seeks to develop controlled movement from a strong core and using a range of apparatus to guide and train the body. Joseph Pilates originally developed his method as mat exercises , but after the first part of the twentieth century, he began using several pieces of apparatus to help people "get the method in their bodies.” Each piece of apparatus has its own repertoire of exercises and most of the exercises done on the various pieces of Pilates apparatus involve resistance training since they make use of springs to provide additional resistance. The most widely used piece of apparatus, and probably the most important, is the Reformer, but other apparatus used in Classical Pilates’ studios include the Cadillac (also called the Trapeze Table), the high (or electric) chair, the Wunda Chair, the baby Chair, the Ladder Barrel, the Spine Corrector (Step Barrel) and small barrel, the Magic Circle, the Guillotine Tower, the Pedi-Pole, and the Foot Corrector.