Seth Rogen adds another dimension of career versatility this week with Pineapple Express , audiences' first glimpse at his impressive action chops. As explained to David Letterman in no uncertain terms on Monday night, however, the Power Schlub — who is starting out preparations for his title role in The Green Hornet — still has a ways to go before achieving the muscular standard of his genre counterparts. For starters, we don't imagine Daniel Craig struggles as mightily with crunches as Rogen has, and even Tobey Maguire seems to have overcome the training anguish to which Rogen claims he's succumbed as unglamourously as possible. But look on the bright side, Seth: If ever Hollywood had a quick fix for a fitter, thinner you, stomach-emptying is indeed as tried-and-true a method as any. Ask anyone — and keep at it! [CBS ]