going back to construction

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I have had a desk job for the past three years, enjoyed it, but it is not to stimulating for the mind and/or body, I have recently taken an offer (for double the money) to dig holes for a living while I go back to school. I was wondering how this will affect my AS (have not started cycle yet), and my body. I know the first couple of weeks are going to kick my ass, but I adapt well.
Any thoughts, or any bothers that work in construction now. Do you still hit the gym as hard? Do you do less back work?