He said he would stand outside behind the house and, with a 5 pound potato sack in each hand, extend his arms straight out to his sides and hold them there as long as he could.
After a while he tried 10 pound potato sacks, then 50 pound potato sacks and finally he got to where he could lift a 100 pound potato sack in each hand and hold his arms straight out for more than a full minute!
Eventually, he even started putting potatoes in the sacks.
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