Bridge Pose (Sanskrit name: Setu Bandasana) is a great backbending posture for beginners.
While typically done at the end of a practice, it can also be used a warm-up exercise for the spine at the beginning. This posture will strengthen the spine and muscles of the back and hips while stretching the abdomen, hip flexors, and chest.
Performed reclined on the back, bridge pose can be stimulating for energy and also calming for the nervous system at the same time.
Caution: If there are any neck or lower back injuries present, it is best to take caution with this exercise.