This practice has an emphasis on detail, precision and alignment in the performance of asana and pranayama (breath control). Asanas (=poses) are held for long periods and often modified with props. Strength, mobility, stability and awareness are gained through the asanas. It can be therapeutic for specific conditions. By paying close attention to the alignment of each asana, Iyengar yoga the practice of precision is suitable for beginners as helps them get into poses with correct alignment. Learning the subtleties of correct alignment, doesn’t mean it is an easy form of practice. It is a deep practice, the best way to learn things with freedom in discipline, as in every class asanas can be performed in endless different ways. B.K.S. Iyengar founded Iyengar Yoga and described it in his bestselling 1966 book Light on Yoga. It is a form of Hatha yoga.