They were the only ones forced to though usually by whipping if they stop for any reason even to stretch a second.
Well that's not true. It even defies logic. No overseer would go down the endless hot rows of cotton just to whip someone for stretching for a second. A slave might have been whipped for not reaching the quota at the end of the day.
Oh wait, as snarky as you usually are, it must have been hyperbole. /sigh