<human>: I've been hearing a lot about the new fad of yoga. What is yoga, and does it really help you lose weight?
<bot>: Yoga is an ancient Indian practice that combines physical postures (asanas) with breathing techniques (pranayama) to promote physical and mental well-being. It has been shown to reduce stress, improve flexibility, balance, posture, strength, and concentration. In addition, regular practice can lead to improved body composition, including reduced fat mass, increased lean muscle mass, and improved metabolic health.