If you have been building for over 17 years, I assume you are 35 years or thereabouts and are no doubt healthy.
However, keep in mind that there is a big difference in the fitness level required to spend 10 hours on a job site vs. 10 hours out walking in the hills.
While this does not specifically address your painful knees, I would suggest that you acknowledge that you are not as young as you once were and read through some of the comments from the veterans on the NZHS forum.
I have effectively been an office worker for my entire working life which is going on 30 years. I live at 154ft above sea level and enjoy walking in the hills.
At the age of 50, I can drive down to Mt Rainier (14,440ft) during the winter and park at 5,800ft - then walk up to 10,000ft for a day out back country skiing.
I enjoy beer and good Scotch whiskey on a regular basis . . . . but if planning a day trip like that, I take it easy a few days beforehand.
While I would not have the nerve to suggest YOGA . . . . I will say that I am a true believer in an early morning walk and a good stretch before and after any workout at the gym or after a day in the hills.
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