Classical ballet is a traditional, formal style of ballet that adheres to classical ballet technique. It is known for its aesthetics and rigorous technique (such as pointe work, turnout of the legs, and high extensions), its flowing, precise movements, and its ethereal qualities. There are stylistic variations related to area of origin, which are denoted by classifications such as Russian ballet, French ballet, British ballet and Italian ballet. For example, Russian ballet features high extensions and dynamic turns, whereas Italian ballet tends to be more grounded, with a focus on fast, intricate footwork. Many of the stylistic variations are associated with specific training methods that have been named after their originators. A Look at Classical Ballet by Rosalie Turner is a useful curated collection that covers the history and relevant concepts within classical ballet in an easy-to-read format.