There are lots of challenges in life, there always are, even having no challenges is a challenge. I have new challenges all the time, as you solve one, another appears. Right now my biggest challenge appears to be routine. In London I had a nice routine, gym, healthy food, walk to work, hang out with friends, weekends to explore. It was a good routine and allows for an almost meditative state of being. Travelling means routine is harder, as things are more flexible, less constants, more stress, less options, less control. I’m currently working on improving my routine, but it's still a daily challenge, and decision-fatigue can get tiring. Because of this lack of routine, its easy to take days off, work on the wrong thing, spend too long on something, miss appointments, work too much, etc etc.