Jessica Biel has opened up about what it really takes to achieve her “peak” toned body — and I fear some of you aren’t going to like it.

Celebrity on a red carpet wearing an oversized black blazer over a black top, smiling with short hair styled sleekly

Michael Loccisano / WireImage

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For context, Jessica is starring in a new Prime Video thriller series called The Better Sister. Her character, Chloe, is clearly super-fit, and there’s one particular moment in the show’s opening when her toned physique is shown off in a backless white dress.

Amazon Prime Video

The white dress clip has been doing the rounds on TikTok, with fans marveling over Jessica’s look, particularly her toned back and arms. However, when one person asked her to “drop the workout routine,” the 43-year-old was quick to manage expectations with some hard truths.

Person speaking into the camera, text on screen reads "Lower Body Workout", with a user comment about a white dress. Framed art visible behind

“Everyone is talking…about the white dress and how do we stay strong as we get older, specifically as women,” she began in her TikTok video. “And how do we keep our back strong?”

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Before detailing her lower body workout routine, Jessica prefaced that a slim and toned body like hers in The Better Sister isn’t something that can be attained just by repeating a specific set of exercises, but by living a very restrictive and disciplined lifestyle, which certainly isn’t easy or doable for everyone.

Actress in a chic textured suit jacket waves and smiles at a formal event

Arnold Jerocki / Getty Images

“I wanted to share that that peak shape in that show is not maintainable unless you are living the strictest and most rigid lifestyle with your nutrition and with your fitness, which I cannot do,” she said. “So I’m currently back on my plan to sort of get a little bit back toward that shape.”

A person in a white sleeveless top speaks while sitting indoors near large windows

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As you may know, Jessica shares two sons, Silas, 10, and Phineas, 4, with her husband, Justin Timberlake. And in the rest of the video, she took fans through her routine, showing how she makes adjustments to accommodate her busy life “on the road.”

At the end of the clip, Jessica was visibly sweaty and breathless as she admitted to the camera: “I’m tired. My body’s not 20 years old anymore, you know? So I’m adjusting my workout to what I need to do.” “You’ve got to build muscle. That’s a key part of my particular routine. And a ton of flexibility,” she said while stretching. “Let’s get older and stronger together.”

Person in workout attire doing a stretch on a wooden floor at home, concentrating on the pose

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I love it when celebrities are transparent about how much work really goes into their appearances, whether that’s cosmetic treatments or strict diets — it doesn’t always come easy (or cheap), and it’s good for us regular folk to hear that! In the comments section, fans have praised Jessica for her honesty.

Person in a white sleeveless top speaking indoors, with a framed picture and a door in the background

“thank you for speaking about the lifestyle that comes with maintaining! this kind of transparency is so important 🙏🏼,” one user wrote, while someone else thanked her for “setting realistic, tangible expectations” for women. “This is SO important for our mental health!”

“THANK YOU for saying that many if not most actors look amazing for a moment in time during shooting and that it is incredibly hard to enjoy life and look like that all the time,” commented another.

“I have a lot of respect for this,” wrote another fan. “Peak fitness like what she’s talking about is a lifestyle.”

Good for her! You can watch Jessica’s full TikTok here.

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