I did a bunch of warehouse jobs when I was at uni. Some of the most depressing and soul crushing jobs I've ever had. The worst ever one I had was pulling a massive roll of sandpaper to a line and then another guy pressed a button to cut it. Then we lifted the cut sandpaper on to a pile. Repeat for 8 hours.
I didn't stay in that one past one day, far too boring.
Let's not romanticise these jobs. I think you're confusing the endorphins from exercise, which most warehouse jobs don't need, with the job.
Most warehouse jobs completely suck.