U.S. gymnast Sam Mikulak got a taste of the Olympics in 2012, finishing fifth in the vault, and he's amped up for an even better performance next summer in Rio. Mikulak has won the past three national championships in the all-around, and he helped the U.S. team win a bronze medal the world championships last year. Whatever happens with Mikulak, it's a good bet that he is going to be energized about it.

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