Iyengar Yoga is based on the teachings of a yoga master B.K.S. Iyengar (author of numerous books including the definitive guide, Light on Yoga). The method of study of Iyengar yoga is progressive with an emphasis on precision and form in order to maintain a balance between flexibility, strength, and relaxation. Through intelligent alignment, sequencing of asanas and timing in the poses, the practice of Iyengar Yoga can safely lead beginning and advanced students alike to a mindful practice that is absorbed with attention so that the mind and body work together. Oftentimes props are used to allow the practitioner to go deeper in the asana, adapt to an individual's needs, make an otherwise challenging asana attainable, or to provide support. In addition to his many innovations that are utilized throughout the modern world of yoga such as props, B.K.S. Iyengar developed therapeutic and restorative yoga that utilize the practice of asana and pranayama for deep relaxation and healing.