The gym is where celebrity trainer Kirsty Godso starts to have fun. The fitness pro, who counts It-girls like Kaia Gerber, Hailey Bieber, Olivia Rodrigo, Charli XCX, and Ayo Edebiri as clients, sat down with ET at the A Day in the Life at Vuori event in Carlsbad, California, on Nov. 17 to share what goes into her sweat sessions. But before you even pick up a dumbbell, Godso says the ultimate warm up starts in your closet. “How you feel in your clothes is so important when you’re going into a workout because if you feel uncomfortable, that’s an energy and emotion you’re carrying with you into everything,” she explains. Sunset Boulevard/Corbis via Getty Images Her current style muse: Angelina Jolie in Lara Croft: Tomb Raider, inspired by Gerber’s recent collaboration with the activewear brand. “Kaia came into the gym in a Lara Croft look with a baby tee and micro biker shorts and I was obsessed. … Vuori’s baby tees are not to be slept on, and I love the low-rise mini shorts …