Self-defense specialist Guro Jayson Pena knows that, in the real world, there are no rules to fighting. That's why he has spent the last three decades studying Bruce Lee's Jeet Kune Do as well as Filipino martial arts—styles that help protect practitioners both in the ring and during real-world encounters. Knowing that fights take place both standing up and on the ground, he trains his students elements of muay thai and grappling.