This sunrise trekk up Mount Batur on Bali was one of the most physically challenging things I’ve ver done. I was so out of shape when I decided to do the trekk, and I had to stop and let all the groups go past me. I sat down for about half an hour until something told me to keep going. I did, and it was worth it. The view is spectacular, and the thrill of walking on an active volcano is unbeatable.