Every week, you should choose one to three experiments to try in order to accelerate towards your goals. Maybe you have an overall goal of getting into better shape. So this week you could try taking a walk early every morning. Another week you could try doing strength training every morning.

A week is enough time to try something out, and short enough that it’s easy to commit to. And it’s short enough that you have a clear memory of the whole time period at the end of the week. You have a clear idea of how the experiment has worked.