Listen: How I Built This | Sara Blakely, CEO of Spanx

At 27, Sara Blakely was selling fax machines and desperate to reinvent her life. So she came up with Spanx — hosiery that eliminates panty lines — and set to work building her business.

During the seven years Blakely sold fax machines door-to-door, she faced a lot of rejection. This is how she dealt with it, and what kept her going.