As the NFL preseason rolls along, we’re getting a look at several of this year’s rookies, both hyped and unsung, franchise saviors and camp invites fighting for a roster spot. But when it comes to evaluating these prospects, there is one BIG feature that NFL scouts have been obsessed with. Yes, NFL scouts love big butts, and they cannot lie. But there’s a lot more to it than scouts simply gossiping about gluteals. There’s plenty of science behind why rear ends matter for athletic performance. And ESPN’s Dave Fleming joins us to share the data that can back it up.

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