Ronnie Ortiz-Magro, who shot to celebrity status on MTV’s The Jersey Shore, recently showed off his return to six-pack abs.

Ronnie Ortiz-Magro Gets 6-Pack Back In 4 Weeks

Ortiz-Magro shared a before-and-after picture of himself on Instagram Wednesday, showing his dramatic four-week transformation. In the before selfie, Ortiz-Magro is sporting a bit of a beer belly and seemed to have lost some definition in his arms. In the after shot, the reality TV personality has tight abs and ripped biceps.

“I really let myself go after I got sick last year. It's been a long road,” Ortiz-Magro captioned the image. “I really let myself go after I got sick last year. It's been a long road. I am nowhere I want to be shape wise, but i feel better than i ever did. #DietingIsKEY#CardioSavedMyGoodYearTire#TransformationThursday #letTheAbuseBegin#WowYouGotFatAsFk #AllThatDrinkingAtTheShore#DoIneedToLookLikeICarryLugguageForALiving#ItFeelsGoodToWipeMyOwnAss.”

Last year in April, Ortiz-Magro was hospitalized with kidney stones, which proved incredibly painful and debilitating. "Wouldn't wish this feeling on anyone!" he tweeted at the time, adding to a curious follower, “I have to [take protein] because I can't hold any food down from the pain."

Ortiz-Magro has been sharing his secrets for the rapid slim-down on Twitter. In addition to weights, cardio and abs, he admits that a healthy diet and a couple supplements were also a part of his strategy.

I was taking TrigX which is a NO2 and than animal pax for all my vitamins etc,” he posted, adding, "Dieting is such a big part! If it tastes good don't eat it lol."