What if a swab of saliva could tell if a player has genetically weak knees, or ankles?

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One might expect that at the ripe old age of 100 the company would be creaking along with brittle bones, weak knees, a bad heart, and finding it hard to get up in the morning.

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Feeling suddenly weak in the knees, I sank back on the hard train seat and glanced again at the gloomy landscape lumbering past the window.

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For Mr Bush, who has openly campaigned to defend the interests of the oil industry, to go suddenly weak at the knees about high oil prices is bizarre.

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We can readily describe sensations of butterflies in the stomach or feeling weak in the knees when things go well, but we are less aware of the ways that kissing helps us to make a reliable assessment of another person.

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"I fought to keep my nerve despite my knees feeling weak, " she told the news agency.

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And this does not cover the legacy of injuries (bad knees, weak shoulders, arthritic hips, etc.) that football players will carry for the rest of their lives.

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