The 45-year-old former Yankee took to social media to share his sweaty weekend workout, and his gym partner had a very familiar face.
J Lo used to be A-Rod's fitness foe, but he swapped her out on Friday for his ex-wife, Cynthia Scurtis.
The MLB host surprised everyone when Cynthia -- who he divorced in 2008 -- popped up on his Instagram Stories to kick off the weekend.
The former duo seemed to be extremely close in the video A-Rod shared showing Cynthia wrapping his knee with ice. He even took a playful jab at his ex-wife in the caption.
"Cynthia is a world class Mommy to our girls ... wrapping ice - though?!?!?! LOL," he wrote over the video.
A-Rod and Cynthia share two daughters -- Natasha, 16, and Ella, 13.
The exes smiled sweetly in the sweaty selfie fresh off a workout.
While A-Rod documented his hangout with his ex-wife, it's not what you think.
The guy smiling alongside them in the gym selfie is actually Cynthia's husband, Miami real estate agent, Angel Nicolas.
While A-Rod made a splash with his ex, J Lo clearly wasn't sweating her former fiancé.
On Friday, Ben Affleck was spotted revving his engine while riding his motorcycle to the Love Don't Cost a Thing singer's Los Angeles home.
Just one day prior, J Lo was caught wearing the Argo actor's flannel shirt while jumping on a private plane and jetting out of Miami ahead of their reunion.
This comes as rumors continue to swirl that the Hustlers actress is moving out of the Sunshine State for good and in with Affleck.
J Lo added more fuel to the fire when she was photographed looking for schools in L.A. for her 13-year-old twins -- Max and Emme -- near Affleck's Southern California home.
But A-Rod's not looking to stay behind. The ex-MLB star was spotted looking lonely while shopping for a bachelor pad in Manhattan earlier this month.
J Lo and Affleck have been inseparable since she called off her engagement with A-Rod in April.
While A-Rod was holding onto hope that he'd win J Lo back, it appears all bets are off now that Bennifer is heating up.