Vinyasa practice refers to when classical asanas are linked in a dynamic flow from one pose to the next. The sun salutation sequence, known as surya namaskar, is used as the foundation upon which additional classical poses are performed. Many other styles of yoga are based on vinyasa practice including astanga yoga, power yoga, hot yoga, and flow yoga. In the Iyengar system, vinyasa is best suited to young people but regularly practiced by all Iyengar yogis.