BEAST’s Yang Yoseob revealed his abs on the July 25th episode of Happy Together 3.
Yang Yoseob said that he went for some boxing training because he likes to box, and in turn it could allow him to lose a lot of fats.
However, fellow BEAST member Son Dongwoon revealed that before, Yang Yoseob would button his shirt all the way down when he slept because he wanted to portray a cute image.  
Yoseob responsed, “People do change. When the body is not that in a good condition, people will take off the shirt from the sleeves, but when the body becomes better, people will take it off by making an X sign.” 
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SOURCE: Starnews