How do you define success? In the current model that we have come to accept, success is equated with overwork, burnout, sleep deprivation, never seeing your family, being connected through email 24 hours a day and exhaustion - put simply it isn't working. In this book, Arianna Huffington rebuts - and extends - the debate launched with Sheryl Sandberg's international bestseller 'Lean In', arguing that a successful life is made up of more than just money and success and must also include what she calls 'The Third Metric': personal care, health, and fulfilment.