Personalized Gym Is Great Youth Long Sleeve T-Shirt. Gym is great. It's better than chocolate cake in rough text with a slice of cake is a funny distressed design to brighten the day of gym teachers, body builders, athletes and fitness gurus. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)