This pose is called the Hero Pose. The pose increases flexibility in the knees and ankles, teaches internal rotation in the thighs, reduces tension in the legs, and is said to aid digestion and soothe abdominal discomfort. It is also one of the classical seated postures for meditation and breath awareness. When your body is properly supported, you can sit in Virasana for several minutes at a time, becoming aware of the natural curves of your spine, the contours of your chest, the movement of your breath, and other internal sensations. In essence, it allows you to practice mindfulness, which is at the heart of yoga.