She's the greatest female athlete in the world over the age of 60, and some say she may be the greatest female athlete of all time.

Each week, Growing Bolder asks top leaders, thinkers, writers, life coaches, entertainers and role models to weigh in on issues affecting our lives.

For anyone who's ever considered giving up, you have to hear the story of Karen Einsidler, who went from a double mastectomy to a world championship.