Slacking and slothfulness begins in the brain with thoughts

 Slacking and slothfulness begins in the brain with thoughts

sloth in the brain means something other than being lazy physically
it means being mentally lazy and just not thinking about
much of anything, instead just automatically reacting to whatever
and doing it because it's advertised or because you see another
person doing it

it is almost a complete lack of the ability to analyze, to ask why
and observe, really pay attention

knowing physical limits does NOT equate with laziness
not knowing physical limits is stupidity and usually comes
from listening to other people who don't know what they are
talking about and trying to make you think you have to do
something and you should compare yourself with others 
and say "if they can do it so can I" (which is bull shit)