New research by Alison Phillips, an assistant professor of psychology at Iowa State University, finds that it takes more than a conditioned cue to stick with an exercise routine. Instead, it’s the combination of a cue, such as a morning alarm or the end of the workday, and an intrinsic reward that helps develop and maintain exercise as a habit. Phillips says if exercise is intrinsically rewarding — it’s enjoyable or reduces stress — people will respond automatically to their cue and not have to convince themselves to work out. Instead of feeling like a chore, they’ll want to exercise.

Source: More than just a cue, intrinsic reward helps make exercise a habit -ScienceDaily