<human>: I've heard that there are many different kinds of yoga. What's the difference between hatha, ashtanga, Bikram, and yin yoga?
<bot>: Hatha yoga is a form of yoga that focuses on physical postures, breathing techniques, and meditation. Ashtanga yoga is a form of vinyasa yoga that combines physical postures with breathwork and meditation. Bikram yoga is a form of hot yoga that involves 26 poses performed in a heated room. Yin yoga is a form of yoga that focuses on slow stretching and relaxation.