Source: Julian Hamilton / Getty Kai Cenat has spent years proving that he can dominate almost any corner of entertainment he enters, but lately, the streaming superstar has been testing himself in a completely different arena. Diamond Gym is not exactly the type of place where somebody can walk in, grab a pair of dumbbells and spend the afternoon filming mirror selfies. Still, the attention did not prevent Kai from completing the workout, interacting with supporters and giving the historic neighborhood gym one of its biggest viral moments yet. Founded by bodybuilding figure John Kemper in Irvington, New Jersey, in 1976 before moving to Maplewood in 1981, Diamond Gym has built its reputation around an old-school, no-excuses approach to training. Diamond Gym has produced numerous professional bodybuilders and national-level competitors, while celebrities such as Queen Latifah and Mark Wahlberg have reportedly trained there.