Jack Harlow is turning into quite the method actor -- the rapper was spotted working his ass off on the basketball court on the set of the "White Men Can't Jump" reboot.
Of course, Jack is no stranger to hoop ... but his Billy Hoyle character is a former college baller, so the dude's gotta look the part when the cameras start to roll.
Harlow can be seen backing down his defender and whizzing by him for a layup in one of the clips ... and appears to be laser-focused on immediate feedback from a trainer.