In the upcoming episode of KBS' 'Superman Is Back', the adorable triplets went on an 'exercise regime' along with their dad, Song Il Kook!

That's because when actor Song Il Kook went to weigh himself on a scale, he was shocked to see the amount of weight he had put on. At that moment, Min Guk approached him with wide eyes and asked, "Daddy, did you get bigger?" making him want to lose the weight even more.

After that, Song Il Kook began to exercise with his kids, as they went to a neighborhood park wearing matching tracksuits. The triplets adorably copied all of the exercises their father did, encouraging him to push himself harder.