Strengthens the back muscles
Stretches the shoulders and chest
Sit on the floor with your legs together and extended in front of your torso. If your torso is leaning back, it may be because tight hamstrings are dragging the sitting bones toward the knees and the back of the pelvis toward the floor. It may be helpful to sit on a blanket or a bolster to lift the pelvis.
A simple way to check alignment is to sit with your back against a wall. The sacrum and the shoulder blades should touch the wall, but not lower back or the back of the head. Put a small rolled-up towel between the wall and the lower back to help