Sun Salutations (Surya Namaskar) originated as a series of prostrations to the sun.  Traditionally it was practiced at dawn facing the sun as a way of welcoming the new day.  This is still a lovely practice in our modern-day life.  

I am not surprised when I hear from so many students that their favourite yoga pose is Shivasana. I mean, what is not to love about coming to a full stop and finally resting after a busy day or active practice?