Diaz is known for talking trash to his opponents during fights, competes in triathlons for recreation and uses his endurance to constantly put pressure on his opponent, as well as pushing the pace of the fight. Diaz has said, "Fighters are afraid of conditioning, they are afraid of getting tired, but I don’t want to have anxiety or be afraid of anything. I can go 100 percent out there and never have to worry about getting tired. Everybody says fighting is 90 percent mental, and it's true. Knowing you can go 15 minutes or 25 minutes without any problem can help you sustain that mental advantage over your opponent..."