Take a break. Balasana is a restful pose that can be sequenced between more challenging asanas.
Child's Pose (Balasana) is yoga's most important resting posture and it is a nice way to gently stretch various parts of your body.1 It's a chance to stop what you are doing, reassess your position, reconnect with your breath, and prepare yourself to move forward. In class, the teacher may offer the opportunity to rest in child's pose after a fast-paced vinyasa sequence, a long hold in a pose like Downward Facing Dog or Plank, or an attempt at a challenging inversion. It is a counter pose for Cobra and other back extensions.
Child's Pose is a gentle stretch for the back, hips, thighs, and ankles. It can help relieve back pain. Learning to use this pose wisely is the part of your developing practice where you listen to your body's inner voice and do what it tells you. Your body will tell you when to rest. It might need different things on different days. Keeping your ear finely tuned to the messages your body is sending you and respectfully responding to them is the greater lesson that child's pose has to offer. You will come to know when to use Child's Pose during your yoga practice.
Avoid Child's Pose if you have a knee injury. If you are pregnant, spread your legs wider and don't press your stomach onto your thighs. If you have a shoulder injury, keeping your arms by your side will provide the most support. If you feel any pain, ease out of the pose.