Beyoncé has always looked beautiful, but since embarking on her I Am … Sasha Fierce tour this summer, the superstar has whipped her body into optimum shape. “She is performing the best shows of her life and her body looks amazing,” her trainer and author of Power Moves, Marco Borges, tells In Touch. “She feels really good about herself, and she’s got a ton of energy.”

Borges reveals the secret to achieving Beyoncé’s incredible physique is training with health in mind, as opposed to looks. “If you think about being as healthy as you possibly can, there is no way you’re not going to look like a million bucks. And that’s what Beyoncé did,” he tells In Touch. Their goal was to make sure she could run around for two hours onstage without feeling winded every night. So before the tour, Beyoncé, 28, did interval training — 45 minutes of alternating between sprinting and running on the treadmill, followed by body-resistance work. Now, Beyoncé does yoga and Pilates for an hour on show days and body-resistance exercises on days when she’s not performing. Borges also tells In Touch that the star eats a sensible 1,600-calorie diet of lean proteins with healthy carbs. “The truth is, it’s a lot of sacrifice. You have to push yourself,” Beyoncé has said. Her dedication is paying off!

For more on Beyoncé’s diet and workout plan, pick up this week’s issue of In Touch, on newsstands now!