When it comes to Miley Cyrus ' work outs, she's coming in like wrecking ball. The "Doctor (Work It Out)" singer recently revealed why she loves breaking a sweat in her hottest outfits , which often includes exercising in heels. "My mantra is, like any athlete, 'Practice how you perform,'" Miley told W Magazine in an interview published June 3.

"So that's why I practice in my heels. The gym looks really tough, but then I've got my ivory Gucci slingbacks because they remind me of Marilyn ­Monroe ." As she put it, "I'm interested in feminizing the workout space, because so much of the workout equipment is ugly.

" And there's more than meets the eye with the pop star's gym method. After all, Miley noted how training in heels gives her a leg up when she's performing onstage . "I definitely have a persona—an expanded, fully realized version of myself that I tap into as a performer," she shared.

"But then there's a level of my life that's super intimate, sacred, and secret." And some of those private moments, Miley teased, includes texting Beyoncé . "I think it's a really cute part of our relationship, because over the past couple of years I've really locked down on my privacy and on what I share with the public," the 31-year-old explained.

"She's the same way." Miley—who collaborated with Bey on Cowboy Carter —noted how they've built a deeper bond with each other. "Part of our relationship is the safety between us," she shared.

"The songwriting or the work is just a small p.