A physical trainer friend of mine will sometimes present his clients with a weightlifting bar with a large amount of weight on each end. He then instructs them to lift the bar, and—of course—they can’t. Next, he tells them to try and lift the weight several times a day for several weeks. After the allotted time, they return and unfailingly report that they can lift the weight over their heads. They often remark that, at first, they never thought this growth in power would be possible!