Proverbs 31:17 (Amplified Bible)
17She girds herself with strength [spiritual, mental, and physical fitness for her God-given task] and makes her arms strong and firm.
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The virtuous woman has a reservoir of inner strength which is able to energize her and enable her to accomplish physical tasks which require a great amount of physical strength. She is not weakened by laziness but she is a wonderful example of diligence and industry. George Lawson describes her in this way:
As rust gathers on metals that are seldom used, so sluggishness of disposition contracts a rust on the powers of the body and mind; and idle persons by degrees realize those excuses for their conduct which were at first mere shams. The virtuous woman is of a very different temper. She declines not any part of her duty through aversion to toil; and by exerting her strength with a cheerful mind she improves it. Her labors give her health and vigor, and alacrity for new labors; so that she can with great ease and tranquility go through those duties which appear impossibilities to other women [Commentary on Proverbs, p. 564].