Socializing, getting a bit of exercise and enjoying the outdoors are part of it, too, but the main reason golfers love their game is because it's hard, and they sometimes succeed anyway.

WSJ: Don't Make Golf Too Easy | Golf Journal by John Paul Newport

The purpose of the General Welfare clause is to provide a reason, motivation, and purpose to the proper exercise of the Powers the Constitution specifically grants to Congress.

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She also had a revelation while seated in front of one of the dioramas (my recollection is that it was the one of salmon-hunting Alaska brown bears standing seven feet tall): that the only reason we exercise dominion over the Earth, and creatures bigger and stronger than us, is because of our larger brains.

WSJ: At 88, a World Full of Wonders

Rodriguez says the main reason that women are victims of the marketing language of diet and exercise is because society in general pressures women to achieve the physical ideal.

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When he resigned, Benedict cited his advanced age as the reason, saying he no longer had the strength for "an adequate exercise of the Petrine ministry".

BBC: Ex-Pope Benedict returns to Vatican