One of the more obvious and first noticed benefits of yoga is that of improved flexibility. When you have your first class, most likely you will be unable to reach your toes, much less, do a backbend. But as you continue with your yoga, gradually you will notice a loosening, and the ability to get into poses that you once thought would be impossible, as they become possible. You will also most likely see your pains and aches begin to disappear. Obviously this is not just a coincidence. When your hips are tight, knee joints can be strained because of improper alignment between the shinbones and thigh. The lumbar spine can be flattened when hamstrings are too tight, causing back pain; and of course poor posture can be caused by the lack of flexibility of connective tissue and muscles, like ligaments and fascia.