The Better Sister actress showed off her latest workout routine, which featured countless core and strength moves throughout a 45-minute session.
"Full-body, start to finish," Biel captioned a June 28 video posted to Instagram in collaboration with her personal trainer Ben Bruno. "Mobility, strength, cardio... and yes, I’m definitely feeling it today."
In the clip, the 44-year-old dons a white tank top, gray high-waisted sweatpants, white sneakers and a black baseball hat as she works with dumbbells of different weights to do a series of mobility and strength exercises as Bruno guides her through the workout.
In the comments of the post, Biel's husband Justin Timberlake joked that he was saying bye, bye, bye to his own fit physique.
The "Like I Love You" singer—who shares sons Silas, 11, and Phineas, 5, with Biel—wrote, "Literally eating onion rings while I watch this."
But while Timberlake may joke about his routine, the *NSYNC alum also trains with Bruno. Indeed, pinned to the top of the trainer’s Instagram page is a video of Timberlake doing what Bruno described as a "very, very impressive" upper body and core exercise two years ago.
"He’s been working super hard to get his body right for his upcoming world tour next month," Bruno captioned the 2024 post, "and as a trainer it’s very cool to see a guy in Justin’s position in life pushing himself like this in the gym."
As for Timberlake’s onion ring confession, he and Biel never hesitate to engage with the other on social media, whether it’s with a heartfelt post or flirty comment. In fact, Biel used Father’s Day as an excuse to praise Timberlake as a parent.
"Happy Father’s Day to the dad who is always ALL in,” she captioned a June 21 Instagram post. “The one who turns ordinary moments into adventures and bedtime into comedy hour. The dad who is not afraid of the tears, the tender, quiet times, or the hard conversations."
"Watching you be a father is one of my favorite things,” the 7th Heaven alum added. “Our boys are so lucky to call you Dad.”
Keep reading for more about Biel and Timberlake's family...
See, all Jessical Biel wants Justin Timberlake to do is be her love.
"Happy Father’s Day to my spectacular husband who is one incredible dad," she wrote in a June 2025 Instagram of the father to sons Silas and Phineas. "And to all the other dads out there doing their thing. Leading with humility and vulnerability. Showin up with understanding and compassion, and always using humor to get through the hard stuff. Major respect and love to all y’all."
It appeared Silas and Phineas had that sunshine in their pockets, got that good soul in their feet. Jessica gave her Instagram followers a peek at their "family summer vibes" in an August 2025 post.
"You’re so many things to so many people," the 7th Heaven star wrote in a message for the singer's 43rd birthday in June 2024. "But to us you are THE ROCK. The rock we climb on, we lean against. The rock that shades us from the sun. And when we recline on you, as we always do, hopefully our butts will keep you eternally grounded and warm. We LOVE YOU."
Justin and Jessica's sons rocked the singer's Forget Tomorrow World Tour merch when he kicked off the concert series in April 2024.
Justin marked the his bride's 42nd birthday in March 2024 by sharing this peek at the actress hugging son Phineas.
Ain't another woman that could take her spot in Justin's life—or this March 2024 selfie.
The Grammy winner also shared this snap of The Better Sister celeb in his birthday post.
Jessica posted a sweet family snapshot as part of her Instagram tribute to Justin on Father's Day 2022.
Justin celebrated Father's Day 2022 by sharing a photo of his "two favorite melodies," sons Silas and Phineas, playing piano together.
Jessica marked her 40th birthday in 2022 with this blissed out pic.
Justin and Jessica said hi, hi, hi to a new decade, celebrating her 40th birthday with cake in 2022.
Silas and Phin marked their mom's birthday with a special banner.
"Thankful for my guys," Jessica captioned heartwarming 2021 holiday snap. "Merry Christmas everybody!!"
Jessica celebrated her "little man" on his fifth birthday in April 2020. "We’re at home, covered in legos and birthday cake right now..." she wrote in the Instagram tribute, "but I just found this pic on my phone from last summer and it made me so happy."
The Sinner actress marked her birthday on March 3, 2020 with a special cake and her one and only. "Celebrating my birthday in style... and by that I mean, in pajamas," she wrote on Instagram. "I made Justin PROMISE not to sing Happy Birthday to me, so he improvised. Sorry you can't hear it, but I'm still laughing. Thank you, you wonderful human, for really listening to me, and for throwing my kinda party. And thank YOU ALL for the birthday wishes. Feeling the love."
On Valentine's Day 2020, Jessica shared a sweet picture of Justin and their son Silas on Instagram. She captioned it, "My valentines. Love you guys to the moon."
Justin, Jessica and son Silas celebrated Fourth of July in 2019 with balloons and patriotic garb.
The trio spent Mother's Day in 2019 getting in touch with Mother Nature.
Jessica and Justin looked madly in love at her birthday party in March 2019.
The famous trio dressed up as Batman, Robin and Harley Quinn for Halloween 2018. "This Halloween was one hell of a block party!" she shared on Instagram. "Happy Halloween from our LEGO family to yours."
"They got candy? LEGO!" Justin joked of their 2018 Halloween looks.
"To my husband who I watch with awe everyday as he guides and teaches, encourages and supports, and above all, LOVES the sh$t, out of his own young man," Jessica wrote on Instagram in 2018. "Happy Father's Day to all the dads out there. We can't do this parenting thing without you."
"If that pic doesn't say ‘City Of Love' then I'm out..." Justin shared of this 2018 snap from Paris.
For Halloween in 2017, the family of three really reached for the sky with their Toy Story looks.
"Happy Halloween from Poppy, Branch and lil Branch. We be Trollin'..." Jessica wrote on Instagram after Halloween 2016.