THERE ARE AB exercises, and then there’s what Jon Batiste is doing on a private patch of beach on Long Island right now. At first glance, the Grammy-winning singer, who’s best known as the former bandleader of The Late Show with Stephen Colbert, looks like he’s holding a basic plank, glutes tight, forearms in the sand. Then he purses his lips.
Suddenly, Batiste, who also won an Oscar in 2021 for Best Original Score, is belting baby-like motoring
