"Something that sounds as simple as running five minutes a day won’t be simple in practice. At a minimum you’ll need suitable running shoes, a place to run, and (hardest of all) a time to run. Establishing a change in habit means scaling a behavioral change to something you can absolutely achieve and sustain forever. If you can manage to fit in a five minute run once a week and at the same time and day each week, you will very likely succeed. And once you have established your run habit once a week, you’ll have a behavioral pattern that makes it easier to extend your run to other days. If, on the other hand, you just pack up your running shoes and head to work with the general ambition of finding five minutes to run every day, you will very likely fail."

In the morning before work at the same time every day has the best chance for success.

For something to become habit, it needs consistency.