The 30-year-old reality star shared the snap with the caption: "My bicep is about the same size lol @rogermathewsnj #socloseyetsofar."
Since posting on Instagram on Thursday morning, Jwoww's pic racked up more than 43k likes.
In the image, Jwoww is striking a pose with her husband Rogers Mathews. The two came together for a mirror selfie during their gym session to show off their muscular biceps.
The MTV star is rocking all black with a workout top and with skin-tight yoga pants. The lovebirds' time in the gym has clearly paid off as they look incredibly fit.
When Jwoww isn't sharing workout pics, she regularly takes to social media to post videos and pictures of her children - Meilani Alexandra Mathews and Greyson Valor Mathews.
On Wednesday, Farley posted a video trying to get Meilani to "go potty."
Jwoww captioned the clip: "Desperate times call for desperate measures!! Learned this potty training trick from @snooki: Basket full of goodies for Meilani!! @awestruck."
"It's crazy. [Our kids] are our mini-me's," Farley said. "They have the same personalities as we do and I have to save the bail money for in 20 years when my daughter wants to go to Seaside and do something stupid. Then Snooki and I started laughing because we'll be in Seaside with them."
To keep up with Jwoww, follow her on Instagram here.
What was your favorite Jwoww moment from Jersey Shore?
Up Next: Jersey Shore Star Jwoww Goes Full Spandex Stretch In New Social Media Pic | Jersey Shore Producer SallyAnn Salsano Makes New Deal With Viacom | Jwoww Reveals Another Workout Selfie, And Things Got Sweaty | Pauly D And Girlfriend Aubrey O'Day Have A New, Strange Reality Show Coming Soon | Jwoww Shares Tattoo-Filled Workout Photo And Video | Snooki Reveals What She Misses Most About The Show | JWoww Is Saving Up Money For Her Daughter's Future Jersey Shore Trip | Snooki Snaps Hilarious Santa Picture With Her Kids
[H/T Instagram: Jwoww]