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The life of a top professional athlete involves hard training, plenty of stress, career-threatening injuries and no shortage of money. But now, some high-profile figures -- think Indianapolis Colts quarterback Andrew Luck and Wales rugby union captain Sam Warburton -- have decided at a relatively early age that the glory and the lucre no longer outweigh the pain. The issue of long-lasting injuries, particularly concussion and its ramifications, looms ever larger for anyone looking to take up a c