Because the prana (energy) must extend through your entire body, it is best to sit with your spine erect. Your neck and head should be in a straight line, but not rigid. The classic beginning sitting pose for pranayama and meditation is the Easy Pose, or Sukhasana. (Sukha means “comfortable” or “joy.”)
It stretches and straightens the spine, which is the fundamental conductor in pranayama, and focuses the mind.