On the beautiful backdrop of sun, sand, and clear blue skies, the cast of Hawaii Five-0 has a tough job to do. Every week on CBS, they have to hunt down some of the most terrible criminals—from human traffickers to arms dealers to murderers and terrorists—before they too-permanently dirty their surrounding paradise. How did the cast train for this treacherous assignment? Snakkle looks back, before they were stars, to see who’s been honing their skills from a younger age.