What is the fine-grained topic of the following text: Some of the other more popular types are: Vinyasa (or flow), Power and Ashtanga yoga which use the same postures as in Hatha but in faster moving sequences so tend to be more physically demanding; Iyengar yoga uses lots of props and focuses on alignment; and Bikram yoga which is taught in a heated room. Only return the topic.
Different types of yoga