Sara Blakely founded SPANX with just $5,000 of personal savings and has grown it to a company that revolutionized an industry. She was selected as one of Time Magazine's 100 Most Influential People in the world, and at age 41, was the youngest woman to join FORBES' World's Billionaires list. In this exclusive interview from #BusinessMastery, Sara shares with Tony the strategies she implemented that helped her bootstrap her billion-dollar business.