Izumi, was born in Aomori, Japan and comes from a fishing family in the Shimokita Peninsula. His father, who can often be seen spectating his son's judo and MMA matches, still fishes for bluefin tuna at over 70 years of age. Izumi began judo at a young age and is known as a very accomplished judoka, winning the men's -90 kg category silver medal at the Athens Olympics in 2004 and the gold medal at the World Judo Championship Games in Cairo, Egypt in 2005.