Each kind tof labour tires you in it’s own way.
Physical work can give you an opportunity to explore and heal your thoughts and feelings.
Mental labour can divert you from physical and emotional pain.
Emotional burden can actually weaken you physically and drain you mentally.
Emotional work that is good is loving and nurturing work.The sort we do for our family and friends. Especially children.
Of course mental strain and physical strain can result from burden. And impact the other areas of life as well.
Work and Burden (overwork) are not the same at all.