TXT's (TOMORROW X TOGETHER) singer and birthday boy Kang Taehyun just turned 21 years old. The K-pop idol is known for his perfect abs that he flaunts on stage. Besides his singing and dance rehearsals, fitness is an important part of Taehyun's routine.

The singer had once revealed his secret In a T:TIME clip before the group completed a pre-recording. Taehyun was already preparing by doing one hundred sit-ups even with his injured finger in a cast. He added that if he lost count he does 5 extra sit-ups. The singer also confessed that he does not deprive himself and indulges in his favourite treats (Golbaengi Somyeon) even before his important performances. He went on to demonstrate his workout regime for fans.