Brooke Shields, 54, wows fans with gravity-defying ab workout: 'You’re making us 50s gals proud!'

Brooke Shields showed off her impressive workout on social media. (Photo: ANGELA WEISS/AFP via Getty Images)

If Brooke Shields's latest Instagram post is any indication, age is nothing but a number.

The 54-year-old actress shared a video of herself and a trainer at Iconoclast Fitness in New York, showing off her incredible fitness skills. The clip shows Shields doing crunches while completely suspended in the air, hanging on to her trainer and using her legs as support.

"Defying gravity at the gym today. Still feeling the burn," Shields captioned the clip. 

And as if the first video weren't impressive enough, the former Calvin Klein model also included a second video that shows her doing an inverted squat while hanging upside down with her feet in gravity books.

Fans and fellow celebrities were quick to praise the star’s show of strength. Jaime Camil, whom Shields acted alongside during her Jane the Virgin guest role, left a clapping emoji and a raised hands emoji. And Shields's Law & Order: SVU co-star Ryan Buggle commented with three muscle-flexing emoji.

The comments from fans were just as positive. "Wow, wow, wow! You’re making us 50s gals proud! Well done you!" one person commented.

"You are a superwoman," another person wrote.

Shields's new post isn't the first time she's showed off her workout routine and toned body. In July, the Blue Lagoon actor posted a video and photo of herself in a bikini while enjoying a day out on the water.

Related: Brooke Shields Reveals Her Daughters Are Behind Her Sexy Swimsuit Pics

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