I take it it is loading bags. It is very hard work, or can be depending on which operators you handle. Charter = bad, business travellers = good. I gained quite a bit of muscle weight during a rather short stint. 40 metric tons of bags lifted during a shift was not out of the ordinary. Long shifts, bad hours, poor environment, injury risk. It's not something you want to do for a long time, but it is a good experience to have.
I thought I was doing good trying to avoid those airport hotels... and look at me now.