Yeah, simply a fun motivational song…after all, imagine fat Whitey’s profits if each of the slaves could actually pick a 500 pound bale of cotton a day…
Not to mention the superior physique one could attain by such activity, as well as greatly increased levels of pain tolerance…
I don’t know why some of you seem to be having difficulties accepting the benefits of being a slave. 
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Edit: while every effort possible (yes every) has been made to avoid devices such as hyperbole or sarcasm, no guarantee of the non-existence of such arguably offensive elements has been or is likely to be evidenced…