If needed, keep the knees bent to avoid putting too much pressure on the lower back. Relax the upper body. Depending on your ability, inhale as you either walk your back up or reach up and out with the hands. Continue up, out and back. Again, push your hips forward.
Legs are straight and neck is relaxed.
Exhale and gently return to tadasana, preparing for the next round. Each of the above steps are repeated, this time leading with the left foot instead of the right. One round of Sun Salutations consists of two sequences, the first leading with the right foot, then the left. It is suggested that you start with at least four rounds, and gradually increase them as you become comfortable. It is key to coordinate the breath with each movement.