How-to: From hands and knees, arch your back so your belly drops toward the floor and chest opens in front of you.
Tips: To maximize the release in your lower back muscles, exhale as you let your back curve downward, and release any holding in your abdomen. To maximize the opening in your chest and upper spine, inhale and pull your shoulders gently back as you arch. Good to practice in succession with cat pose.
Benefits: Releases muscles along the whole spine.