ATEEZ's Choi San has revealed the secret to his bulking up that transformed him from 52kg at the start of his debut into his current "Northern Grand Duke" physique. We have summarized everything at once, from his diet of six meals a day to the workout routine he has maintained for four years.

You've all seen the meme circulating the most on online communities these days, right? 😭

As soon as ATEEZ's Choi San's early debut photos were revealed on broadcast, reactions like "Is this really the same person?" started pouring in.

He has such a solid physique now that the nickname 'Grand Duke of the North' feels perfectly natural, but they say he weighed only 52kg when he debuted 🔥

I’ve gathered and summarized only the stories revealed personally by Choi San himself, detailing exactly what his physical bulk-up process was like ✨

1. 52kg at the start of debut, a past photo that caused a stir in the studio

Choi San and Hong Joong appeared together on episode 421 of MBC's 'Omniscient Interfering View', which aired on October 24.

When Yoo Byung-jae started by saying, "I understand that you weren't always in good shape," Choi San calmly confessed, "I weighed 52kg."

Then, when a photo from their early debut days appeared on the screen, the MCs were genuinely surprised, asking, "Who is this?" 😂

Compared to his current muscular physique, he feels like a completely different person.

2. The reason I decided to bulk up was 'complex' and 'stage'

Hongjoong, who was standing next to him, said that San E had a complex about his thin physique in the early days of his debut, so he worked out really hard.

Choi San himself admitted this part as well.

He said he decided to bulk up because ATEEZ's choreography is so powerful and involves such big movements, so he thought he needed to build up his body to properly pull off the stage. 💡

The point is that it wasn't just for show, but a 'body for the stage.'

3. Choi San's bulking diet: 6 meals a day plus snacks and milk.

Since gaining weight was the top priority, they said they drastically increased their food intake first.

6 meals a day

The method of 'shoveling' high-calorie snacks with milk between meals

Consistently combine exercise and diet

As those of you with a naturally thin build know, eating itself is just as hard as exercising 😭

I heard that he continued doing this for a whopping four years to build his current physique.

4. A 4-year workout routine, without fail, even in hotels

The manager boasted that San-i is serious about taking care of his body, so he exercises every day and never skips it, even when staying at a hotel.

In fact, the broadcast captured the scene of him working out from the morning at the hotel gym where he stayed during his schedule. 🔥

chest exercises

chin blow

Heavy dumbbell exercises

The members of ATEEZ's workout group 'Eusha Eusha' even joined in, and we sweated it out together.

The members looked at Choi San's chest muscles and said they would aim for the title of 'Second Chest,' and at the dinner table, they even gave him the nickname 'Choi San Chest Toast,' which reportedly made everyone burst into laughter 😂

It’s an episode befitting the star of the globally sensational 'BAD' chest dance.

5. ATEEZ's inner strength behind the Northern Grand Duke's physique

The broadcast that day highlighted not only Choi San's individual management but also the group's stage attitude.

Hongjoong, Seonghwa: Push for the stage despite diagnosis of fractured ribs

Yeosang: Personally setting the bone after breaking his finger and finishing the performance.

If you look back at your career, it's truly amazing ✨

Billboard 200 No. 1 three times

Entering a US concert stadium

First K-POP boy group stage at Coachella

Grand Prize Winner at the Awards Ceremony

Now in their ninth year since debut, the moniker 'Miracle of a Small-to-Middle Agency Idol' wasn't given to them for nothing.

In his acceptance speech, Choi San stated that the most important thing is to do what he has always done, and expressed his desire to become an artist who consistently delivers great performances.

It turns out that 'consistency' was the secret to both taking care of my body and performing on stage. 💪

💡 Frequently Asked Questions (Q&A)

Q. What was Choi San's weight when he first debuted?

A. Choi San personally revealed on 'Omniscient Interfering View' that his weight was 52kg when he first debuted. He has not disclosed his current weight.

Q. How long did Choi San bulk up?

A. He says that he worked out for about four years to build this physique. The manager told me that he still exercises every day and doesn't skip a workout even at the hotel.

Q. How was Choi San's bulking diet?

A. It is said that he ate six meals a day and filled up on calories by eating high-calorie snacks with milk between meals.

Q. Which episode of *The Manager* did Choi San appear in?

A. I appeared with Hongjoong on episode 421 of MBC's 'Omniscient Interfering View', which aired on October 24, 2026.

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와 진짜 몸 잘키운거 같아요!
배드 무대보고 좋아져서 계속 찾아보네요

2026.10.28 12:54

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How different is Choi San before and after bulking up? A comprehensive summary of his physical management secrets revealed by himself.