coexertion

Wait till the current runs rapidly, fretting and seething in its angry haste, when for a moment's delay the boat must lose ground; when the poles are plunged into the rocky bed like harpoons into the back of an escaping whale; when the athletic forms of the men are bent forward until each prostrates himself in the exertion of his full powers; when not a false step -- each step a run -- can be hazarded; when that monotonous unanimity of labor is at its height, in which each boatman becomes possessed as if by a devil of strife; when their faces lose every gentle semblance of humanity, and become distorted to a simple expression of stubborn brute force; when the muscles of their arms are knitted, rope-like, and every nerve stretched to its utmost; -- wait till you have seen all this, and you will confess that a woman's lazy life can know no harder toil than that of the mind's sympathetic coexertion, -- that is, if she be excitable or impressible.

The Atlantic Monthly, Volume 07, No. 39, January, 1861 Various