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It's summer 2005 in Baltimore, Maryland.

Under Armour CEO Kevin Plank is staring out the window of his office as he waits for someone to pick up the phone.

The sky outside is bright blue with a hazy shimmer from the humidity.

Plank knows that within seconds of stepping foot outdoors, he'll be dripping in sweat.

For years, sweat was his biggest nemesis.

As a linebacker for the University of Maryland, the cotton t-shirts he wore under his football

pads would get soaked, becoming heavy and clingy, slowing him down on the field.

So he set out to fix the problem.

Nearly ten years ago, Plank created a shirt that wicked sweat away from the body,

the cornerstone product that became the foundation of a company he named Under Armour.

Now, that company is one of the fastest rising sportswear brands in America.

A receptionist finally answers his call, and Plank asks to speak with Edward Stack.

A moment later, Stack comes on the line.

Kevin, how are you? Those new running shirts are selling like hotcakes.

That's great to hear. Hey, do you have a minute to chat?

Stack is the CEO of Dick's sporting goods, the retail chain, founded by his father in 1948.

It's one of the largest retailers of Under Armour products.

And over the years, the two men have become close.

Sure, what's on your mind?

Well, you know how we're preparing to take Under Armour public?

...