pat down.As the days of shirtless acting drew near, Robert Pattinson was meticulously “counting sips of water” to prepare for his stripped-down scenes.The former “Twilight” actor, 35, stars as the Caped Crusader in the 2022 reboot of “The Batman.” But to play a death-defying, mysterious hunk takes intense preparation, including a strict diet.In fact, he undertook “months” of physical preparation for the acclaimed role.“I had about three months before the movie started, and then you’re working out before and after work all the time,” he told People on “The Batman” premiere red carpet Tuesday night. “You just cut down and cut down and cut down before the couple of scenes with your shirt off, and you’re counting sips of water.”Going shirtless in the movie, he said, was motivation to look his best.“Shame is my biggest motivator, 100%,” he joked.But Pattinson’s scenes aren’t all shirtless.