Utthita Balasana is a good posture to connect more consciously with the breath, and to deliberately breathe into the back of the body and lungs. Every inhalation domes the back of the body upward, and every exhalation lengthens the torso and spine.
It is a cooling and calming posture, particularly good for re-centering after a challenging asana practice, or as a restorative pose. The gaze can be taken down or inward to encourage the introspection of this forward bend.
This posture is said to be calming for the muladhara chakra, and helps to settle the earth energy in the pelvis area. It is also said to calm the vata energy in the body because of the lowered position of the head.