In his bestselling book, Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones, author James Clear writes about a powerful tool called the implementation-intention tool, which is a great tool for achieving and starting new habits. He writes:

IN 2001, RESEARCHERS in Great Britain began working with 248 people to build better exercise habits over the course of two weeks. The subjects were divided into three groups.
- The first group was the control group. They were simply asked to track how often they exercised.
- The second group was the “motivation” group. They were asked not only to track their workouts but also to read some material on the benefits of exercise. The researchers also explained to the group how exercise could reduce the risk of coronary heart disease and improve heart health.
- The third group received the same presentation as the second group, which ensured that they had equal levels of motivation. However, they were also asked to formulate a plan for when and where they would exercise over the following week. Specifically, each member of the third group completed the following sentence:
“During the next week, I will partake in at least 20 minutes of vigorous exercise on [DAY] at [TIME] in [PLACE].”
In the first and second groups, 35 to 38 percent of people exercised at least once per week. (Interestingly, the motivational presentation given to the second group seemed to have no meaningful impact on behavior.) But 91 percent of the third group exercised at least once per week—more than double the normal rate.
The Implementation Intention is a plan you make beforehand about when and where to act.