Answer
In addition to judo and MMA, Ishii has also competed in kickboxing, a combat sport that involves striking techniques such as punches, kicks, and knees. Kickboxing is distinct from judo and MMA as it primarily focuses on striking rather than grappling techniques, and it often incorporates elements from other combat sports like karate, Muay Thai, and boxing. Ishii's experience in kickboxing has contributed to his well-rounded combat skills.