How to Make Exercise a Habit

To make exercise a habit, pick a simple, specific workout and do it in response to the same cue each time, such as a set time or right after something you already do every day. Keep repeating it there until it starts to feel automatic. Expect that to take a couple of months, not a few weeks. In the best-known study of real-world habit formation, the median time for a new daily behavior to come close to its peak automaticity was 66 days, and individual times ranged from 18 to 254 days (Singh et al., 2024; Lally et al., 2010). Missing one day along the way did not materially set people back (Lally et al., 2010).

What a habit actually is

In psychology, a habit is an action that’s triggered automatically by a cue you’ve linked with it, such as putting on a seatbelt after getting into the car. Repeating a simple action in the same context builds that link, and once it forms the action depends less on conscious motivation. That means a habit can last even after your motivation dips (Gardner, Lally & Wardle, 2012).

How long it really takes

In Lally and colleagues’ study, 96 volunteers chose an eating, drinking or activity behavior and did it daily in the same context, such as after breakfast, for 12 weeks. They rated each day how automatic it felt. Of the 82 people with enough data, the researchers could fit a habit curve for 62, and 39 of those showed a good fit. People who performed the behavior more consistently tended to fit the curve better (Lally et al., 2010).

Automaticity rose quickly at first and then leveled off. The time to reach 95% of each person’s plateau ranged from 18 to 254 days, which the authors said shows considerable variation and that it can take a very long time (same source). The median was 66 days (Singh et al., 2024). The study lasted 84 days, so the longest times are projections from each person’s fitted curve, not observed ones (Lally et al., 2010). Simple actions such as drinking water became automatic faster than more involved routines such as doing 50 sit-ups (Gardner, Lally & Wardle, 2012).

Later research points the same way. A 2024 systematic review included 20 studies with 2,601 participants. Four of them reported how long habits took to form: medians of 59 to 66 days, means of 106 to 154 days, and individual times from 4 to 335 days. The authors suggest expecting at least two to five months for a new health habit (Singh et al., 2024).

For exercise specifically, a study that followed 111 new gym members for 12 weeks found that at least four workouts a week for six weeks was the minimum needed to establish an exercise habit (Kaushal & Rhodes, 2015).

Seven steps that help it stick

1. Start smaller than you think

Habit researchers advise small, manageable changes. Failure is discouraging, and simpler actions become habitual more quickly (Gardner, Lally & Wardle, 2012). In the gym study, workouts with low complexity predicted stronger habits (Kaushal & Rhodes, 2015). This fits the US guidelines, which say some physical activity is better than none and advise inactive people to “start low and go slow” (HHS). A short bodyweight workout for beginners is an easy place to start, and you can build toward the full weekly targets later.

2. Tie it to a cue you meet every day

Decide exactly when and where you’ll do it, and choose a time and place you encounter every day. A cue inside an existing routine, such as your lunch break, gives you a stable starting point (Gardner, Lally & Wardle, 2012). Write it as a plan: “After I get home from work, I will do my 15-minute workout.” One study found clock-time cues and routine-based cues worked about equally well, so use whichever you’ll meet more reliably (Singh et al., 2024).

3. Keep the routine the same

Mixing things up keeps workouts interesting, but variety takes effort and works against automaticity (Gardner, Lally & Wardle, 2012). Consistency was the strongest of the predictors in the gym study (Kaushal & Rhodes, 2015). Once the habit of showing up is set, you can change what you do inside the session, for example by following a home workout plan.

4. Plan the details and prepare

In one physical activity study, planning the specific time and setting for exercise and building a preparatory routine, such as a daily routine for getting your exercise clothes ready, helped explain why the intervention group formed stronger habits (Singh et al., 2024).

5. Choose exercise you enjoy

Enjoyment predicted exercise habit strength among new gym members, and the authors told trainers to keep exercise fun and simple for new clients (Kaushal & Rhodes, 2015). The CDC gives the same advice: pick activities you enjoy and that match your abilities (CDC). Choosing your own goal helps too. Habits people pick for themselves tend to form more strongly than ones set for them (Singh et al., 2024).

6. Track it and put it on the calendar

Gardner and colleagues suggest a simple tick sheet while the habit is forming, with a weekly rating of how automatic it feels (Gardner, Lally & Wardle, 2012). The CDC suggests writing physical activity on your calendar and inviting a friend to exercise with you regularly (CDC).

7. Don’t let one missed day become two

Missing a single opportunity did not materially affect habit formation in Lally’s study (Lally et al., 2010), and automaticity gains soon resumed (Gardner, Lally & Wardle, 2012). Skip the guilt and get back to your cue the next time it comes around.

When to talk to a doctor first

The US guidelines say physical activity can be safe for almost everyone. They also say adults with chronic conditions or symptoms should be under the care of a health care provider, and can ask a health care professional or physical activity specialist which types and amounts of activity suit them (HHS). The CDC also says to talk to your doctor before starting vigorous activity if you have been inactive, have a disability, or have overweight (CDC). That matters if your new habit is something intense like HIIT.