Exercise and depression: what the research shows — and why it is so hard to start

“I know a walk would help. Everyone keeps telling me. But when I’m standing at the door, my shoes weigh ten kilos.”

I hear this sentence often, in many versions. The person does not need another article telling them that movement is good for mood. They know. They also know that they have felt better after a walk before. And that is exactly why the feeling of staying on the sofa anyway is so much heavier: on top of the tiredness comes the reproach that they “can’t even manage that”.

In this post I want to say two things. First, what the research on exercise and depression really shows — because the findings are surprisingly strong and need no embellishment. Then, why it is so hard to start, and how to understand that not as a lack of willpower but as part of depression itself. The difference between the two decides whether the advice “go for a walk” helps, or simply adds another stone to the rucksack.

What the research says

Researchers have been studying the link between movement and depression for decades, and in recent years we have reviews that bring together a great deal of data. In 2024, a group of Australian researchers led by Michael Noetel published a network meta-analysis in the BMJ of more than 200 randomised trials with over 14,000 participants with depression. They found that walking or jogging, yoga and strength training were associated with a clear reduction in symptoms of depression — with effects comparable to those that psychotherapy and medication achieve in studies. The effect was larger when exercise was somewhat more vigorous, but walking was also among the more effective forms.

Another kind of research asks whether movement also prevents depression. A meta-analysis led by Matthew Pearce and James Woodcock (2022) showed that people who move at least half the recommended amount — roughly equivalent to an hour and a quarter of brisk walking a week — have an 18% lower risk of depression than those who do not move. Importantly, the biggest gain in benefit came at the start, in the shift from almost no movement to a little movement.

That last finding matters most to me. You do not have to become an athlete. The biggest difference is between doing nothing and doing a little.

Why movement works at all

When people hear “exercise helps with depression”, they often think of endorphins and the “runner’s high”. That explanation is too simple. Researchers, among them Aaron Kandola and colleagues (2019), describe several mechanisms working at once:

• Physical. Regular movement affects inflammatory processes, the stress response and the growth of new connections in parts of the brain linked to mood and memory.
• Sleep. A body that moves during the day falls asleep more easily in the evening and sleeps more deeply. In depression, sleep is almost always disrupted; I wrote about this in Depression and sleep.
• A sense of capability. When you do something even though you do not feel like it, you get a small piece of evidence that you are not completely helpless. With depression, which tells you every day that you cannot cope, this is precious.
• Interrupting rumination. Walking, especially outdoors, pulls attention out of your head and into your surroundings. For a moment, the same circling thoughts pause — professionally we call this rumination.
• Contact with people. A walk with a friend, a group class, or simply greeting a neighbour on the stairs are small doses of contact that depression likes to avoid.

You can also find a short explanation of the link between physical activity and wellbeing in the knowledge base under movement and mood.

Why it is so hard to start

This is where most advice stops. It says that movement helps and expects the person to go. But depression is not just sadness. It is a state that affects exactly what you need in order to do anything at all: energy, will, and the expectation that something will be pleasant.

Three things happen at once. First, the body really is tired — not “just in your head”. Depression often shows up as heavy legs, aches and exhaustion, which is the subject of Depression and the body: pain, fatigue and digestion. Second, the reward system is weakened: the brain no longer predicts that a walk will be pleasant, so there is no inner pull. We call this anhedonia. Third, the thoughts that accompany depression devalue every effort in advance: “What difference will ten minutes make?”

That is why I do not believe in the advice “just force yourself”. When someone forces themselves and fails, they read it as proof of their own inadequacy — and depression gains one more argument. I explained in more detail why depression takes away your drive exactly when you need it in Why depression takes your drive exactly when you need it most.

The will comes after the action, not before it

One of the most useful ideas I know in relation to depression comes from behavioural activation. It is a form of therapy built on a simple observation: people with depression wait to feel better so that they can then do something. But depression keeps them waiting. Behavioural activation reverses the order — first you do a small thing, and the mood follows, sometimes only a few days later.

I described the method in more detail in Behavioural activation: how to move when there is no motivation. Movement fits into it nicely, but with one condition: not as “exercise”, but as an activity that has some meaning for you. A walk to the bakery for fresh bread. The way to your allotment. A ten-minute loop with the dog, who has to go out anyway.

When movement has a purpose other than “I have to move because it’s good for depression”, its weight changes. It is no longer a test you can fail. It is simply a way of getting somewhere.

Small doses count

People often set themselves goals that would be demanding even without depression: running three times a week, the gym every day, ten thousand steps. When they don’t reach them, they stop. Yet research shows that even a small dose is useful — and that the difference between nothing and a little is bigger than the difference between a little and a lot.

So with the people I work with, I like to start with a question: “What is the smallest thing you could do tomorrow, even on a bad day?” The answers are sometimes almost comically small. Put on your shoes and step out onto the balcony. Walk to the end of the street and back. Five minutes of stretching by the window. And that is fine. A small step you take is worth more than a big one you only plan.

The steps then build up slowly, like stairs. However fast it goes, the rule is the same: you move to the next step only when the previous one has become almost second nature. And if a harder week comes, you go back down a step or two without shame.

Walking has a special place here. You need no equipment, no membership, no good fitness. In Slovenia we are lucky that nature is almost always close: a riverbank, a forest path above the village, a park. Walking outdoors, especially in daylight, also helps regulate your internal clock, which matters when sleep is disrupted. If you would like to add attention to your walking, there is a short exercise in the knowledge base called walking with attention.

A conversation I often hear

This is roughly how it sounds when someone first meets the idea of small doses (a composite, not a real person):

“Ten minutes? That’s nothing. I used to run half marathons.”
“You’re not running half marathons now. Right now you’re not even going to the post office. Ten minutes is more than nothing.”
“But I’ll feel like I’m kidding myself.”
“Maybe. Or after ten minutes you might notice whether anything changed — in your body, in your head. Just notice. It doesn’t have to be much.”
“And if nothing changes?”
“Then you went out even though you didn’t feel like it. That says something too.”

Comparing yourself with what you could do before is one of the biggest obstacles. The body in depression is not the same body as before it. Demanding the old level from it is like asking someone with a broken leg to run. Comparing yourself with others who “just go” does not help either.

Exercise: the smallest step for this week

Take a sheet of paper or the notes app on your phone. The exercise takes ten minutes, and you can do it today.

1. Write down one route you already have. Where do you have to go this week anyway — the shop, work, the dog, the children to school? Choose one.
2. Add five minutes to it. Walk instead of driving, get off a stop earlier, do a loop round the block before going home. Nothing more.
3. Rate your mood before and after on a scale from 0 to 10. Don’t expect a big jump. You are only interested in whether there is a difference — and what kind.
4. Write down one thing you noticed. A sound, a smell, the light, a person. This is not decoration: it is how you practise letting attention come away from your thoughts for a moment.
5. At the end of the week, read your notes. Don’t judge how much you did. Just look at whether any day was a little easier — and what was different that day.

If one day doesn’t work, nothing is wrong. The exercise is not a test. The next day is a new attempt, not a resit.

Where movement is not the answer

I want to be very clear here, because the message “movement helps” can easily turn into something harmful.

Movement is not a substitute for treatment in severe depression. The studies showing strong effects mostly involved people with mild to moderate depression. When depression is severe — when you can barely get up, are not eating, not sleeping, or thinking about death — you need to see a doctor or psychiatrist, and often a combination of treatments. Movement can be part of the path, but it is not the path itself. How medication and therapy complement each other is the subject of Antidepressants and therapy are not rivals.

Movement must not become one more proof of guilt. If someone tells you “you’d feel better if you moved a bit more” in a tone that means “it’s your own fault”, that is not advice but reproach. I explained why such advice does not help in “Just snap out of it”: why advice from loved ones does not help.

For some people, exercise is already part of the problem. For people who exercise compulsively, who use exercise to control their body or food, or who have a history of eating disorders, “more exercise” is not the right advice. Then the answer lies elsewhere.

With physical illness, ask your doctor. Heart problems, chronic pain, pregnancy or injuries require adjustments that a professional needs to confirm.

If you are having thoughts that it would be better if you weren’t here, the first important thing is a conversation with someone — not a walk. In Slovenia, call the crisis line Klic v duševni stiski on 01 520 99 00 (every day from 7 pm to 7 am) or the Samaritans helpline on 116 123 (24 hours a day). In an emergency, call 112.

How loved ones can help

If someone close to you has depression, it is natural to want to get them out of the house. But the way you do it matters. The invitation “let’s walk to the park together if you feel like it, I’m going anyway” is something completely different from “you should exercise more”. The first offers company; the second hands out a task.

It helps if movement is not conditional on a good mood. You can walk in silence. You can turn back after five minutes. You can agree to go even if one of you stays quiet the whole time. That kind of presence without expectations is often worth more than the best argument. It also helps not to keep score of their successes. Praise like “well done, you finally went out” can sound like a grade that will have to be earned again next time; a simple “it was nice walking with you” stays with the relationship. In relational family therapy, in which I am training, we talk a lot about exactly this: that mood does not change only within an individual, but also within the relationships that carry them.

What to remember

• Research shows that walking, yoga and strength training are associated with a clear reduction in symptoms of depression.
• The biggest difference is between nothing and a little movement — you don’t have to become an athlete.
• Difficulty getting started is not laziness but part of depression: tiredness, anhedonia and thoughts that devalue everything.
• The will often comes after the action, not before it — so start with the smallest step you can manage on a bad day.
• In severe depression, movement is not a substitute for treatment — see a doctor and seek professional help.