No matter what our personality, change can be difficult—even when those changes are tiny ones. We often find ourselves in negative routines that we haven’t changed for months, or even years. So how can we go about adopting new, positive habits that will actually last? In this talk for 99U, best-selling author Gretchen Rubin reveals how knowing our personality type can help us change behaviors and build new habits. Want to understand yourself better in 4 weeks? Be sure to check out Gretchen’s track on Happify!