Sometimes, we could use all the motivation at our disposal to simply get off the couch and start exercising.

Seeing celebrities — especially those who have been in the game for decades — hitting the gym with impressively sculpted bodies never hurts, if those reels ever pop up in our feeds.

That includes Jessica Biel, who took to Instagram over the weekend to show off one of her dumbbell workout routines.

"Full-body, start to finish. Mobility, strength, cardio… and yes, I’m definitely feeling it today. 😅," reads the caption of her joint post with @benbrunotraining on Sunday, June 28.

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Fans have since engaged with Biel, 44, on social, flooding her post's comments section with inquiries about her regiment and supportive words as well. "Probably one of only a few actresses where I’m legit impressed by her hard work, dedication, and results," wrote one Instagram user, while another person commented, "I am going to go do this at the gym right now. Her body is killer."

Oh, and her celebrity husband also chimed in on Biel's recent post. "Literally eating onion rings while I watch this," Justin Timberlake commented with his signature humor — and it's been "liked" at least 3,584 times as of Monday, June 29.

All jokes aside, the "SexyBack" singer, 45, also trains with Ben Bruno, as E! News points out. Pinned to the top of the trainer’s Instagram page is a video of Timberlake doing his own intense workout from a couple years back.

"Check out @justintimberlake casually crushing 10 L-sit ring chin-ups with a weight vest on and a medicine ball between his feet," reads the caption of Bruno's post from 2024. "This is a very, very impressive display of core and upper body strength. Go try it for yourself to see just how difficult this is. He’s been working super hard to get his body right for his upcoming world tour next month, 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."