Final answer:
The universal truth best supported by the ideas in "The Olympic Swimmer" is Practice makes perfect.
Step-by-step explanation:
The universal truth best supported by the ideas in "The Olympic Swimmer" is Practice makes perfect. The passage describes the hard work, dedication, and strength of the swimmers, emphasizing their practice and effort. The line 'Hard work wins the Olympic race' further reinforces this idea, suggesting that success in the Olympics is a result of consistent practice and determination.
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