It’s no secret that famed actor Danny Trejo is a big fan of the UFC.

What MMA fans may not know however is that Trejo did numerous stints in various prisons and jails, with his final stint in the 70s being a 5-year prison bid.

During that time, Trejo not only became an accomplished boxer, but actually went on to become a lightweight and welterweight prison boxing champion!

In the video above Trejo opens up on his boxing career, and discusses Floyd Mayweather Jr.’s impact on the boxing world.