How a 34-year-old former bodybuilder built one of the most highly valued startups in the world

Brian Chesky didn't know much about tech before starting Airbnb.

The 34-year-old CEO majored in industrial design in college and dabbled in hockey and bodybuilding in his 20s. But now, he's grown an idea that stemmed from overbooked hotels into a multibillion-dollar startup and become one of Silicon Valley's key players.

Here's how the upstate New York native became one of the richest young tech founders in America.