Credit: Kim Zolciak on Instagram Photo: Kim Zolciak Heads to the Gym

Kim Zolciak is ready to get serious about getting back into pre-baby — or, we should say, pre-babies — shape! The former Real Housewives of Atlanta cast member and current Don't Be Tardy star took to her Instagram to announce that she's committing to the gym again and you'll never believe who she got to be her trainer: duh, her incredibly fit husband, Kroy Biermann, of course!

"Gym flow! It's time to get it together ... I got the best trainer in the house @biermann71," Kim wrote on the picture-sharing site, along with a photo of herself decked out in a black sweatsuit with big, dark sunglasses.

Her selfie prompted her fans to remind Kim that she already looks freaking amazing for anyone, let alone a mother of four babies under three years old, including twins that she had only two months ago!

Girl plz!! u look good!!!," responded one fan, while another gushed, "You had twins 2 months ago and you look better than I do with no kids! "Ask Believe and Receive" you are so blessed!"

Not everyone was as supportive of Kim's achievement, however. One slightly jaded fan wrote, "When one has money they can do a thing! Best trainers best chefs."

Kim was annoyed enough to respond to her snarky follower, tweeting back, "no chef and no trainer hunni."

Even though Kim just said that Kroy is her trainer, what she probably means is that she isn't throwing down loads of cash on a fancy celeb trainer.

Regardless, Kim has already shared her secret to staying super fit, but unfortunately it's not for everybody. Right before she had Kaia Rose and Kane Ren, Kim revealed that the reason she's been able to keep her amazing figure so easily is mostly due to genetics.

Do you think Kim needs to lose more weight? Sound off below!