Many trekkers or hikers may worry about being physically fit or experienced in outdoor sports. It is quite good if you are physically fit. Of course, some adventure wilderness tour demands physical conditions but every travel destination does not need physically fit.
If you are a normal trekker or hiker don’t worry about it, there is always a professional guide who will manage your itinerary according to your conditions. So, you should not be worried about pre-kills just be ready mentally. If you have a strong willingness then you will be fine under your itinerary. We would not refer the tour if it is out of your conditions and limits.