For years, people have tried to speculate why Joe Rogan has never fought in the UFC. He is in great shape, has so much knowledge of MMA and was a Taekwondo champion. Joe mentioned how obsessive he got with Taekwondo and mentioned:
I was getting headaches too, just from sparring. I did not spar smart. I sparred meathead style. I know a lot more today than I ever did then as far as consequences and what is important and how to learn better. It wasn’t calculated and intelligent. [It was] just being obsessed, constantly training all the day.