Does it get any better?

I'm talking physically. I was hired on a month ago at an SSD building, and we were told that our bodies would get used to the aches and pains. I'm only 28 and still find myself feeling like I just got jumped after the 4 day week. Does the soreness and overall body tiredness ever get any better?

Side note, what are some good shoe recommendations & insoles to get from Zappos or the Amazon website?