Translation of resurgimiento

Hi Christin, how are you? I am on vacation right now, but you can call me if there are any problems. I am planning to meet my students in the end of next week. I will deliver the message anyway.
The climb was much exhausting than I had presumed. I had forgotten that we were at high altitude where there is less oxygen and that every step required double effort. It was a great exercise.
We woke up around one hour before arriving and got off the train once it arrived at its destination. We checked in for our last night in the same hotel very early in the morning after having coffee of course.