"300" ain't just a movie to Glen "Big Baby" Davis ... it's his goal body weight to make it back to the NBA.
The ex-Celtics, Magic and Clippers player missed the 2015 season due to injury -- and put on a few LBs as a result.
But now, the 30-year-old NBA champ (2008) says he's training like a maniac and focused on shedding 30 pounds to get back to playing weight.
In fact, Big Baby even showed off a few of his yoga moves right on the street -- dude's more limber than he looks!
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