1. Mexico: La Pistola y El Corazon

Actor Frank Grillo visits Mexico City, where he meets Julio César Chávez, speaks with aspiring boxers and learns the one rule of Mexican boxing.

2. Thailand: Fortunate Son

In Thailand, Grillo sees firsthand why muay thai is known as "the art of eight limbs." Later, he visits a true titan of the sport.

4. Senegal: If I Should Fall From Grace with God

Grillo -- along with countless passionate fans -- gets caught up in the pageantry as two highly respected Senegalese wrestlers prepare to battle.

5. Israel: Masters of War

In Israel, Grillo receives a lesson on Krav Maga, a unique style of hand-to-hand combat used by citizens and military forces alike.