It is intensely physical but can be infused with devotion
The oldest-known yoga text to describe the Sun Salutation sequence, the Yoga Makaranda, was written in 1934 by T. Krishnamacharya, who is considered by many to be the father of modern hatha yoga
In The Yoga Tradition of the Mysore Palace, yoga scholar N.E. Sjoman identifies an earlier text called the Vyayama Dipika (or “Light on Exercise”) that illustrates athletic exercises for Indian wrestlers, including some that are strikingly similar to Krishnamacharya’s version of Surya Namaskar
Renjiveda's Ocean of Love - "renjiTham" 