Yesterday, GOT7‘s Jay B accepted BamBam‘s workout challenge as he posted a shirtless picture, showcasing his broad shoulders.

jay b fitness
| @jaybnow.hr/Instagram

BamBam, of course, is not one to back down from a fight, so he responded back on social media. It didn’t end there, however.

During BamBam’s live broadcast, a viewer asked, “What can you say about Jay B’s back?” He revealed that he was not expecting Jay B to respond like that, but he’s not intimidated.

I didn’t know he was going to came to me that hard though … It’s random. I think, you know, his back… it’s cool, it’s big, but, you know, he’s always big. He a big guy. It’s God-given, you know what I mean? But he gained…he have a lot of muscle, but it’s not cut…like I do!

— BamBam

| BAMBAM/VLIVE

BamBam is clearly not worried about any competition! For those who are unfamiliar with fitness lingo, he then went on to explain what he means by “cut.”

You know your muscle, it can be big, but if it’s not cut, then it just look … like it’s hard to tell is it muscle or is [it] fat, you know what I mean? If you’re cut that means muscle, so it’s going to be in a good shape so you can see all the line, you know what I mean, your shoulder line, your arm line on the front, on the back…

— BamBam

| BAMBAM/VLIVE

Jay B still looks pretty cut to me though. ????

You can watch him talk about Jay B and their workout challenge below: