Wish to Circumambulate around Mt. Kailash
I don't know much about Mount Kailash but I trekked in Nepal over 100km with my 18 year old sister when I was 24. My sister was not particularly athletic but we did fine. While I was an athlete, I had been meditating full time for the previous 5 months so I was not exactly doing vigorous exercise. One day of the trek included walking up the very steep 3200 stone steps at Ulleri. We made it fine. 

69 Surya Namaskar shows a lot of fitness. Sounds like you will do fine. Maybe walk up a few hills to tone up the leg muscles. 

The 'spiritual' part is having an open mind to take in the culture &amp; atmosphere. Just go! With faith! 

I always enjoy looking at the old photographs. Very warm &amp; wholesome memories. It was a very worthwhile experience. Below is the Tibetan side of the Himalaya.