He points out that a team of basketball players can win, at most, one gold for their country, while a swimmer can win two golds for swimming the same stroke the same distance twice: once individually and once as part of a relay team.

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Calves swimming in echelon showed a 28% increase in average swim speed and a 19% increase in distance per stroke.

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The distance travelled per tail stroke also fell, by 13%, when mothers were accompanied by their young.

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The device saves all the data from each hit, namely the animation, path, putter-face angle at impact and throughout the stroke, angle of attack, tempo, impact speed and swing path distance -- in other words, more information than most players would know what to do with.

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He finishes the season with a best-ever stroke average of 70.7, and his driving accuracy (63.9%), driving distance (288.2 yards) and greens in regulation (69.8%) are all improvements on previous years.

BBC: SPORT | Golf | European Tour stats attack