Kumbhakasana or the Plank Pose develops strength of core muscles of the shoulders, arms, trunk and legs. In Sanskrit, Kumbhaka means the holding of breath and Asana means a pose. In the final pose, the breath (or Kumbhaka) is held to maintain the posture.
Chaturanga Dandasana or Four Limbed Staff Pose is a basic pose to bring balance and strength to arms and legs. In sanskrit, Chatur means four and Anga means part (of the body). Danda means the staff and asana means the pose. It is also known as the Low Plank Pose.