qnli question: What is a common background for a Japanese wrestler? sentence: Many of Japan's wrestlers including top stars such as Shinya Hashimoto, Riki Choshu and Keiji Mutoh came from a legitimate martial arts background and many Japanese wrestlers in the 1990s began to pursue careers in mixed martial arts organizations such as Pancrase and Shooto which at the time retained the original look of puroresu, but were actual competitions.