It looks like Boom has been working out quite a bit during his time in the military! On September 5th, the entertainer tweeted a set of photos saying, "I will show you everything tonight! If I can't show you everything... I'll show you more next week~�^^* Boom-heart comeback show!", referring to his recent comeback on SBS's 'Strong Heart'. Fans were at a loss for words after seeing Boom's well-toned and muscular body, but they still managed to comment in awe, "I can't stop staring...", "wow...", and "Your two years in the military definitely paid off". What do you guys think of Boom's newly sculpted body? Source + Photo: Boom's Twitter