Her fourth book, KEEP IT MOVING, is Twyla Tharp’s playbook for harnessing vitality and finding purpose as you age. At seventy-eight, Twyla Tharp is revered not only for the art she makes, but also for her astounding regimen of exercise and nonstop engagement. She is famed for hitting the gym each morning, using energy to propel her schedule as a teacher, writer, creator and lecturer. This book grew out of the question she is asked most frequently: “How do you keep working?”