But then he added he wouldn't back down from the challenge.
Kyle Larson warns gamblers not to waste their money on him despite Indy 500 betting odds
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Busch added that he's dealt with arthritis and gout while trying to shake lingering effects of a brain injury that rocked stock car racing a year ago.
NASCAR driver Ryan Preece gets medical clearance to return home after terrifying crash at Daytona
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