I've got this feeling that doing hard labor doesn't mean working hard, wrong or right?
Of course, you're right. Even without a dictionary, common sense should be enough to figure this out.
A hard labour type of job demands hardwork
(mandatory), but the pay can either be good or as hard as the job itself.
We even see this in our society these days. People working their ass off, doing difficult tasks that wear them out both physically, emotionally, and mentally. And the ugly thing is... Not all hard labour pays well.
I think at the end of the day, you just don't want to find yourself doing any hard labour Job that pays a penny. Those two things literally don't go together, because that's another definition of suffering.