Gwyneth Paltrow showed off her toned bikini body in a sauna selfie shared Tuesday to Instagram. 

The 48-year-old actress posed for the selfie while wearing a two-piece blue, black and white patterned bikini. Paltrow said the "secret" to her "summer radiance" involves a "multipronged approach."

"The secret to ultimate summer radiance involves not just a last-minute swipe of bronzer but a multipronged approach: good food, great exercise, a glow-inducing supplement, powerfully restorative skin care, and of course some fun stuff (highlighter, self-tanner, and more)," the "Country Strong" actress wrote in the caption of her post.

The photo was shared on her wellness brands' Instagram account.

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Gwyneth Paltrow attends Paris Fashion Week in 2019.

Gwyneth Paltrow posed for a sauna selfie wearing a patterned bikini Tuesday. The actress shared the photo on the Instagram of her wellness brand, Goop. (Pascal Le Segretain/Getty Images)

Paltrow has been open about her beauty and wellness secrets in the past since starting her wellness brand, Goop.

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The "Iron Man" actress' favorite form of exercise is walking. 

"I started walking about a year and a half ago, and I make sure to walk every day," Paltrow told CNBC in January 2020.

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Walking is "time to let the brain disengage from input, while having fresh air and moving the body," she explained at the time. "It’s also, from a research perspective, turning out to be one of the healthiest things we can do is just walk."