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Being driven to succeed from an early age is one thing—predicting the future is another. Sure, to get to the Olympics is the goal, and athletes have got to start training very young to eventually become the world's best. But a number of athletes at this year's Summer Olympic games matched their hard work by telling the world a long time ago that they would definitely be showing up at an Olympics.

1. Michael Phelps.

It's amazing he survived to compete: there is no lifeguard present.
It's amazing he survived to compete: there is no lifeguard present.