田上明
Morishima attended Urayasu High School where he took part in judo. His instructor, Shoji Abe, was friends with Mitsuharu Misawa, and managed to get Morishima a tryout with All Japan Pro Wrestling, which he passed and shortly after began training with the promotion for a career in professional wrestling. Initially, Morishima was a protégé of Misawa, but after Naomichi Marufuji joined the promotion and Misawa decided instead to focus solely on training Marufuji, Akira Taue took Morishima under his wing and trained him. Morishima debuted for All Japan in 1998, but left in 2000 to join the newly formed Pro Wrestling Noah (founded by Misawa), where he became a mainstay.