Singer Son Dambi and Kahi took part in pilates which showed off their incredibly tight bodies.

On a recent broadcast of MBC Music's 'Son Dambi's Beautiful Days,' Kahi showed off how she keeps in shape and shared her love of pilates.

During the show, Kahi wore a tight pilates outfit that showed off her skinny body, and using a reformer, she showed off various poses.  Son Dambi saw her and said, "I can't do that.  No way.  How do you do that?"

But Son Dambi, true to her dance singer title, followed in Kahi's footsteps and held the same poses.  Kahi said to Son Dambi, "This pose can help strengthen your core muscles," and encouraged her labelmate.

But perhaps the pose was too much for her because Son Dambi shared her discomfort and said, "I have a cramp in my butt," causing much laughter.