Yoga of any type can be a great, low-impact approach to becoming more flexible. How is this feat accomplished? Yoga creates poses that ultimately stretch out unused muscles, not only helping with flexibility, but this also helps increase your range of motion. The only downside? You need to continually keep up the practice to reap the benefits.
Do not become discouraged if it seems that your flexibility is not improving right away. For some, it only takes a few weeks of practice to notice that their bodies have become more limber. Others may take up to a few years before any changes can be noted.