By Brandi Fowler
Updated Mar 24, 2017 @ 7:45 pm
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Brooke Shields
Credit: Sean Zanni/Patrick McMullan via Getty

If you need a little inspiration to keep up the hard work in the gym (or step it up) before summer hits, take one look at Brooke Shields.

As the 51(!)-year-old former supermodel hit the beach with her bestie, she spotlighted her chiseled physique on the shore in a photo she shared on Instagram Thursday, which showed her striking a pose with her hand on her hip in a bandeau blue bikini and straw sun hat.

"The hard work is starting to pay off," Shields captioned it ... and it certainly is. In the snap, the actress's sculpted abs, arms, and legs are all visible as she looks out onto the beach as her brunette locks cascade over her bikini top. If this is the "start" of her fitness regimen paying off, we can't even imagine how her body will transform when she reaches her goal.

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Although Shields didn't reveal the fitness and diet secrets behind her toned bikini body just yet, one thing is for sure: she's only getting better with time.