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Olympic swimming hero Alys Thomas retires at 31 with 'arthritis of a 60-year-old'
READ MORE: Strictly's Louis Smith says BBC show was 'harder' than training for 2012 Olympics "My tolerance levels are high on the whole but it's getting more and more difficult to get what I need to do in training in order to stay competitive within the sport. At the moment I find it difficult to drive a car, cut up my food, pick things up, writing. But the athlete brain, as toxic as it is….I don't really care about that stuff as long as I can swim.