The 401(k) has become the No. 1 way for Americans to save for retirement. And save they have. The average plan balance has hit a record high, and the number of million-dollar-plus 401(k)s has more than doubled since 2012. In the first part of this series, we shared tips for building a $1 million retirement plan. Now meet workers on track to join the millionaires club—and get inspired by their smart moves. Once you hit your goal, learn more about making your money last and getting smart about taxes when you draw down that $1 million.