Apple Dictionary defines this term as
..activity involving mental or physical effort done in order to achieve a purpose or result.
It basically tells us that whenever we put our heads in our offices and fields of labor, we should be in our well-rounded state: mentally and physically alive and present.
Take note, there should be a purpose or result. There should be a goal and a vision to follow.
Don’t follow where the path may lead go instead where there is no path and leave a trail. (Anonymous).
Also, make a difference.