Best Advice Possible
Keep his knees together and lift with his back.
You’ll find few tile guys that haven’t had at least one hernia operation, some two or three. I had an uncle that was in the tile business, and after his third operation his doctor said, “find another line of work or find another doctor.”
He found another line of work. (those boxes are heavy and small)
This is not life work, this is a skill to have and to barter. He likes driving big motorized equipment too much and is in a heavy equipment program.