[A]. Kneel on all fours, abdominals drawn in. Inhale and gently arch your back, tipping your tailbone up, eyes looking up toward the sky (this slide).
[B]. Exhale and round your back as you tuck your chin in toward your chest (next slide).
[C]. Sit back on your heels into Child's Pose and relax for 1 breath.
Repeat sequence 10 times. Remain in Child's Pose for 5 slow breaths to cool down.
You can use this move during labor.