When you are at a certain point in you life when you already have a past and still have a future.
A worksheet, notebook or an app. The main point is that the scale is years, for instance: last 5 years, this year, next 5 years. You fill the past at a year level with everything that was important to you from the past. Everything you think is important for you this year. Where you want to be (health, finance, family, education – anything you think is important to you) and what you want to do in future years.