Because he hasn't been able to do sit-ups. The Aquaman star revealed on the Oscars red carpet in March that he had undergone hernia surgery the day before the ceremony. During an appearance on The Late Late Show with James Corden on Tuesday night, host James asked the Dune actor if he's fully recovered from the operation and Jason revealed his physique is not quite where he'd like it to be."It's all good. (I'm) still not really doing sit-ups, just trying to keep the dad bod going for a little longer, you know what I mean?"