Stretching (passive stretching, as well as active stretching) is just one part of yoga. Yoga also involves (1) isometric exercises that build strength and mobility (poses/postures), (2) slow-moving, dynamic exercises that help build body awareness and control, (3) an emphasis on breathing to help you improve your body-mind connection, (4) balancing postures to help you develop your strength and improve balance, and (5) a much greater emphasis on proper technique. Stretching is casual - it’s something you can do while watching a TV show without too much focus. It helps you release muscle tension, lengthens muscles, and relieves joint pain - but it has no lasting effects. The benefits of stretching are mostly temporary. A good strength and mobility-focused yoga program - even one that is yoga for beginners - has much more long-lasting benefits. It improves your focus, increases flexibility and mobility, builds strength, improves balance, increases mindfulness, and much, much more. It involves much more focus - it is something you are completely involved in and demands 100% attention.