Sara Blakely’s journey is one of the most inspiring stories in entrepreneurship. She went from making $200 a week as a waitress and selling fax machines door to door, to starting Spanx with only $5,000. With no background in fashion or business, Sara faced rejection after rejection but refused to give up. Her persistence led to Spanx becoming a $1.2 billion brand, making her one of the youngest self-made female billionaires.