Does Exercise Help Anxiety and Depression? The Evidence
By Paul Butler · Online Coach & Personal TrainerI am a personal trainer, not a therapist, which makes me exactly the sort of person who should be careful answering this one.
I am also aware that "have you tried going for a walk" is one of the most irritating sentences in the English language when you are genuinely struggling. So: does exercise help anxiety and depression? Yes, and by a decent margin, and the research behind that is better than most things I write about. It is also not a replacement for treatment, and anyone telling you it is has something to sell. Both of those are true at once.
You can call Samaritans free on 116 123, any time, day or night, 365 days a year. They will listen and they will not tell you what to do. For urgent mental health help the NHS has local crisis lines, and you can call 111 and choose the mental health option.
None of what follows is a substitute for that. Please make the call first and read the rest another day.
Does exercise help anxiety and depression?
Yes. The biggest review of the evidence so far found medium-sized improvements in depression, anxiety and general distress when people became more active, compared with usual care. That held across healthy adults, people with diagnosed mental health conditions, and people managing long-term illness.
What the biggest review actually found
This is an umbrella review, which means a review of reviews. It pulled together 97 of them, covering 1,039 trials and 128,119 people, which is about as much evidence as exists on a question like this.
| Outcome | Effect compared with usual care | In plain English |
|---|---|---|
| Depression | Median effect size -0.43 | A medium improvement |
| Anxiety | Median effect size -0.42 | A medium improvement |
| Psychological distress | Effect size -0.60 | The largest of the three |
An effect size around 0.4 to 0.6 is not a miracle and it is not nothing. It is roughly the size of effect you would be pleased to see from a treatment that is cheap, has almost no downside, and improves about nine other things at the same time.
"Physical activity should be a mainstay approach in the management of depression, anxiety and psychological distress."
Two findings in there surprised me. Higher intensity activity was associated with bigger improvements, which cuts against the gentle-movement-only advice you usually see. And the effect got smaller the longer the programmes ran, which probably says more about people drifting off a study than about exercise wearing out.
The caveat the headlines left out
When this came out, a lot of coverage ran with a line about exercise being better than medication. I am not going to repeat that, for two reasons.
The first is that it is a bigger claim than the paper makes, and the paper is the thing I read. The second is that somebody somewhere reads that and comes off their medication because a fitness person on the internet implied they should, and I would rather chew glass.
There is also a quality problem the authors are upfront about: of the 97 reviews they pooled, 77 were rated critically low on the standard tool for assessing review quality. The direction of the evidence is consistent and believable. The precision of any individual number in it is not. That is the honest version, and you will not often see it in a post that is ultimately trying to get you to exercise.
So why is "just go for a walk" still annoying?
Because it is advice aimed at the wrong moment. It assumes the barrier is not knowing, when the barrier is that getting off the sofa feels like a physical impossibility. Being told the solution when you cannot reach it is not help, it is a reminder.
What actually works is making the first step embarrassingly small. Not a session. Shoes on and to the end of the road. Research needs an intervention to measure; you just need something that happens today.
And the thing nobody says: on a bad day the walk might not make you feel better. It is still worth doing, because the effect in that study was not measured on Tuesday afternoon. It accumulated over weeks. The smallest possible version of a workout exists for exactly this.
When exercise makes you feel worse
It happens, and it does not mean the research is wrong or that you are broken. Usually it is one of three things: you are under-eaten, you are under-slept, or you went far harder than your current state could absorb.
The fix is almost never stopping. It is doing less, more often, and eating properly around it. If you consistently feel wiped out for days after light activity, mention it to a GP rather than training through it.
Worth saying too: anxiety and a hard session feel physically similar from the inside. Raised heart rate, fast breathing, a bit shaky. For some people that overlap makes exercise feel threatening at first. Starting with walking rather than intervals is a reasonable response to that, not a cop out.
Where I stop
I am a qualified personal trainer, a qualified nutritionist and a qualified life coach. The life coaching qualification covers habits, motivation and the behaviour underneath them. It does not make me a therapist, and the distinction matters more here than anywhere else I write.
So I will help you build a week you can keep. I will not treat depression or anxiety, and I will say so plainly if that is what is in front of me. If you are not already talking to someone, your GP is the door, and this is not the first time the two subjects have overlapped on this blog. This article is general information and not medical advice.
Frequently asked questions
How much exercise do you need for it to help your mental health?
Less than you would think, and the trials used all sorts: walking, lifting, yoga, cycling. There was no single winning type. If you want a number, the NHS baseline of strengthening twice a week plus regular movement is a sensible target, but something small and repeated beats a plan you abandon.
Is walking enough, or does it have to be hard?
Walking counts and it works. That review did find bigger improvements from higher intensity activity, so if you can push a bit, it looks worth it. But the gap between walking and nothing is far larger than the gap between walking and sprinting.
Can exercise replace antidepressants or therapy?
Not a question for me, and not a question for any coach. It is a conversation with your GP. What the evidence supports is exercise alongside whatever else you are doing, which is a very different claim from instead of.
Why do I feel worse after the gym when I am already low?
Most often because you are short on food or sleep, or you went too hard for where you are today. Try halving it rather than skipping it. If light activity reliably floors you for days, that is worth raising with a GP.
DM me STARTING on Instagram @paulbutler.coach and I will send you The Starting Point: five days of the fundamentals, then a four week plan built round your real week. No cost, no catch. It is deliberately small, because small is what gets done.
If you would rather have someone checking in, see how online coaching works. Rather just talk it through? Book a free 15-minute call.
This article is general information, not medical advice, and nothing in it is a reason to change or stop any treatment. Samaritans are free on 116 123, any time. For urgent mental health help, call 111 and choose the mental health option.
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The effect sizes and the conclusion are from Singh et al. 2023, British Journal of Sports Medicine 57(18):1203-1209, an umbrella review of 97 systematic reviews covering 1,039 trials and 128,119 participants, quoted and linked in the text. The note that 77 of those 97 reviews scored critically low on AMSTAR is the authors' own. Images from Pexels (free to use): Tapas Das, Joyal Thomas, Teodor Olei.
