Locust Pose (Salabhasana) is a yoga pose that strengthens the back, glutes, and hamstrings. It is a backbend that is often used to open the chest and shoulders. To do the pose, begin by lying on your stomach with your arms at your
From Wikipedia
Cobra Pose or Bhujangasana is a reclining back-bending asana in hatha yoga and modern yoga as exercise. It is also performed in some forms of the cycle of asanas in Surya Namaskar, Salute to the Sun, as an alternative to Urdhva Mukha Svanasana, Upward Dog Pose. The Yin Yoga form is Sphinx Pose.