[All] Rise Musclemon Seongchan Anton stage photo.. Is this arm muscle real?

Seongchan and Anton, both of them are usually full of charm, but in these candid shots, they look amazing!!

When you see his arm muscles, you can really feel his other charm. I think you can see how hard he worked out while preparing for the stage. His great arm muscles are captured in the photo, so I'm amazed. Is it possible to be this cool without showing off your strength? The results of working out naturally show up, so he looks even cooler. ㅠㅠ