A fan asked this during the Samsung Galaxy Player Party event.

Woohyun: Most of us only wear our underwear
Host: Oh , guys - 
Woohyun: do that often 
Host: Yes .. 
Woohyun: But the funnier thing is, Hoya works out like this
Host: WEARING ONLY YOUR UNDERWEAR? 
Hoya: My body works out well that way
Host: You have a nice body though-
Hoya: Oh .. yes .. 
Dongwoo:  Sungjong doesn’t wear just his pants
Woohyun: He wears his top but- 
Hoya: If he’s cold, he puts on his jacket but just doesn’t wear pants
Host: He’s cold and wears a top but never the pants
Sungjong: Well, for guys.. not wear pants is really refreshing. 
* Infinite members laugh out of embarrassment 
Host: Sungjong is so cute right? 
Inspirits: Yes

        -120413      (translations by elizeboo. take with full credits)

LIKE OOOOOOOOOOOMG. HOYA WORKING OUT IN JUST HIS UNDEARWEAR @______________@

and then there's Jongie..lol~

Here is a fancam of the interview ^^ It's Myungjong focused!~

http://www.youtube.com/watch?v=ZkhqYmfIteg