WATCH: MLB Network breaks down Heyward's swing

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Chicago Cubs right field Jason Heyward has been retooling his swing this offseason in Arizona.

MLB Network's Sean Casey talks about the differences in his old and new and improved swing in the following video.

.@TheMayorsOffice headed to #Studio42 to talk about the changes Jason Heyward is making to his swing on #MLBTonight. pic.twitter.com/9yWqYiS5FO

— MLB Network (@MLBNetwork) January 13, 2017

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