RM is the tallest member of BTS. Standing at 181 cm., he towers over his members and other K-pop idols.

Jungkook, who is the youngest member of the group, was mostly considered to be the most buff out of the bunch, but RM is slowly taking that spot. Last year, J-Hope shared that he was so shocked to see the BTS leader’s arms and claimed they were the size of his thighs.

While it sounded like J-Hope was exaggerating, recent appearances of BTS confirmed that the “Ego” rapper was not lying at all. It’s no secret that the boys are working out a lot, mostly for their core and stamina, but it seems like RM is taking things up a notch and had been buffing up.

In a recent interview, RM wore a tight-fitting black shirt that flaunted his incredible physique. He looked so huge compared to the rest of the members that ARMYs started a “Trainer Series.” These hilarious tweets are about RM being a strict trainer of BTS instead of their leader. Big Hit Entertainment CEO Bang Si Hyuk was not exempted from the joke.

In the same interview, proof of J-Hope’s claim of RM’s arms being the same size as his thigh was captured. (Check out the photo here).

On Sept. 12, RM held a live stream for his birthday to celebrate with ARMYs. The BTS leader mentioned that he knew about the memes going on about his buff body, saying that a friend told him about it.

Even though RM clearly gained a lot of muscle mass, he clarified that it was only his tight shirt that made his arms appear more buff. However, his humble explanation didn’t work for ARMYs. While the BTS star was busy clarifying things, fans were taking screenshots of his buff body.

Meanwhile, J-Hope may be impressed with RM’s buff arms, but the BTS rapper is also gaining some muscles of his own. Many have noticed that the “Chicken Noodles Soup” hitmaker had a healthy weight gain, and Jungkook is fanboying over it.

BANGTANTV previously uploaded videos of BTS Answer: BTS 3 UNITS. The three different videos consist of RM and Suga, V and Jimin, and Jin, J-Hope, and Jungkook.

Many have noticed that in Jin, J-Hope, and Jungkook’s video, the Golden Maknae couldn’t stop touching the rapper’s thigh. At one point, Jungkook even massaged it and even gave it a quick slap. (Watch the clip here).