Exercise can help with low winter mood, but it isn't a stand-alone treatment for seasonal affective disorder (SAD). A large 2024 review in The BMJ found that walking or jogging, yoga and strength training each reduced symptoms of major depression compared with control conditions. The few trials that tested exercise in people with SAD are small and short. For winter-pattern SAD, the treatments with the strongest track record are light therapy, a type of talk therapy called CBT-SAD, and medication, according to the National Institute of Mental Health (NIMH).
Use regular movement alongside those treatments. A morning walk outdoors fits well because it combines daylight with exercise.
Winter blues or seasonal affective disorder?
NIMH notes that many people feel down or have the "winter blues" when the days get shorter. SAD is diagnosed when those mood changes are more serious and affect how a person feels, thinks and behaves. It is a type of depression that comes back with the seasons, and symptoms typically last about 4 to 5 months a year. The winter pattern is the more common type; a less common summer pattern also exists.
| Winter blues | Seasonal affective disorder (winter pattern) | |
|---|---|---|
| What it is | A common dip in mood or energy as days get shorter | A recurring type of depression tied to the seasons |
| Impact | Noticeable, but you keep functioning much as usual | Serious enough to change how you feel, think and behave, including at work, at home and with other people |
| Typical symptoms | Feeling a bit low, sluggish or less motivated | Symptoms of depression (persistent sadness or emptiness, hopelessness, loss of interest, low energy, trouble concentrating), plus oversleeping, overeating with carbohydrate cravings and weight gain, and social withdrawal ("hibernating") |
| Pattern | Varies | Depressive episodes in a specific season for at least 2 consecutive years, more often than at other times of year |
| What helps | Daylight, activity, sleep routines and social contact | Professional care: light therapy, psychotherapy (CBT-SAD) and/or antidepressants, with lifestyle habits as support |
NIMH says SAD usually starts in young adulthood and is much more common in women than in men. It is also more common farther north, where winter days are shorter (Alaska and New England, for example, compared with Texas or Florida), and in people who already have depression or bipolar disorder. SAD follows daylight hours rather than the calendar, so it isn't the same as the "holiday blues." The causes aren't fully understood; NIMH points to possible roles for serotonin, melatonin and a body clock that doesn't adjust to shorter days. Only a health care provider can diagnose SAD.
What the research says about exercise and depression
The biggest recent summary is a systematic review and network meta-analysis by Noetel and colleagues, published in The BMJ in February 2024. It pooled 218 randomized trials with 14,170 participants who met clinical cut-offs for major depression. Compared with active control conditions such as usual care or a placebo pill, walking or jogging, yoga, strength training, mixed aerobic exercise, and tai chi or qigong all had moderate effects. Three findings are useful for planning:
- Harder sessions helped more, but easy ones still helped. The effects grew with the intensity prescribed. Vigorous exercise did better than light activity, though the authors say light activity still produced clinically meaningful effects.
- People were more likely to stick with strength training and yoga. Participants in those groups were less likely to drop out than those in control groups.
- Exercise held up against standard treatments in this analysis. The effect for walking or jogging was in the same range as the effect for cognitive behavioral therapy. The authors concluded that exercise could be considered alongside psychotherapy and antidepressants as a core treatment for depression, not instead of them.
The limits matter. Only one of the 218 trials met the Cochrane criteria for low risk of bias, and few blinded participants or staff, so expectations may have inflated some results. The authors rated their confidence in the evidence as low for walking or jogging and very low for the other types of exercise. These trials were about depression in general; they weren't designed around SAD or the winter blues.
Exercise for SAD specifically: small, limited studies
A 2024 systematic review by Rothenberg and colleagues in the Journal of Psychiatric Research looked for randomized trials of lifestyle changes for SAD, including diet, exercise, time outdoors and sleep. It found only 6 studies in total. Every study was rated at high risk of bias, the certainty of evidence was very low, and the authors said they could not draw a valid conclusion about whether lifestyle changes work for SAD. Both the treatment and control groups improved in every study.
| Study | Who and how many | What they did | Result and main limitation |
|---|---|---|---|
| Pinchasov et al., 2000 (Russia) | Women; 9 per treatment group with winter depression | 1 hour of stationary cycling at midday, or 2 hours of 2,500-lux light, for 1 week | Exercise and light helped about equally. Tiny groups, one week. |
| Wirz-Justice et al., 1996 (Switzerland) | People diagnosed with SAD | A 1-hour outdoor walk every morning, or low-dose artificial light (used as a near-placebo), for 1 week | 50% remitted after the walks vs. 25% after low-dose light. One week; daylight and exercise can't be separated. |
| Partonen et al., 1998 (Finland) | 120 indoor workers, November to January (not limited to people with SAD) | Supervised fitness training 2–3 times a week for 8 weeks in bright light (2,500–4,000 lux) or ordinary room light (400–600 lux), or relaxation sessions | Exercise in bright light eased "atypical" winter symptoms (such as oversleeping and carbohydrate craving) and raised vitality more than exercise in ordinary light. Mostly healthy volunteers. |
| Leppämäki et al., 2002 (Finland) | 124 relatively healthy adults; 98 completed | Group aerobics twice a week for 8 weeks, in bright or normal light, or stretching and relaxation in bright light | Both exercise and bright light eased depressive symptoms; bright light reduced atypical symptoms more than exercise. Not a SAD patient group. |
These trials hint that exercise and light both help winter mood, and that combining them may help more. No large, high-quality trial shows that exercise alone treats SAD.
Light therapy is the established treatment for winter-pattern SAD
Bright light therapy and medication are the first-line treatments for SAD, as the 2024 Rothenberg review puts it. NIMH describes the usual approach: sitting in front of a very bright light box (10,000 lux) for about 30 to 45 minutes a day, usually first thing in the morning, from fall through spring. The light box filters out ultraviolet light. NIMH says people with certain eye conditions, or who take medicines that make them more sensitive to light, should use one under medical supervision.
The research behind light therapy is stronger than for exercise in SAD, though not flawless. A 2005 meta-analysis in the American Journal of Psychiatry (Golden and colleagues) found that bright light and dawn simulation reduced SAD symptoms, with effects similar to those seen in many antidepressant trials. A 2020 meta-analysis of 19 randomized trials (Pjrek and colleagues) again found light therapy better than placebo, while noting the studies were small to medium in size and varied in quality.
NIMH lists two other evidence-based options. CBT-SAD is a version of cognitive behavioral therapy, usually two group sessions a week for 6 weeks, that uses "behavioral activation": planning enjoyable or meaningful activities, including getting out of the house. NIMH says it works about as well as light therapy, and in a two-winter follow-up its benefits appeared to last longer. Antidepressants can take 4 to 8 weeks to work; extended-release bupropion is FDA-approved to prevent seasonal episodes when taken from fall into early spring. Evidence for vitamin D is mixed.
NIMH also notes that starting treatment before symptoms usually begin may help prevent episodes, so if you've had a rough winter before, talk to a provider now rather than in January. A light box you buy yourself isn't a substitute for an assessment.
Why a morning walk outdoors makes sense
A daily walk in morning daylight overlaps with several of the ideas above: walking was one of the best-supported types of exercise in the 2024 BMJ review, morning is the usual time for light therapy, and the one-week Swiss study found a daily outdoor morning walk outperformed low-dose artificial light in people with SAD. It's also the kind of planned activity CBT-SAD encourages.
A walk isn't a measured light treatment, though: daylight brightness varies with clouds, latitude and time of day. If a provider has recommended a light box, keep using it. After clocks fall back on November 1, mornings get lighter for a few weeks before the shortest days in late December; our guide to keeping workouts and sleep on track after daylight saving time ends covers how to shift your schedule.
A weekly plan for short, dark days
This plan follows the federal Physical Activity Guidelines for adults (at least 150 minutes a week of moderate aerobic activity, such as brisk walking, plus muscle-strengthening on at least 2 days) and leans on the types of exercise with the most evidence for depressive symptoms. It assumes you're cleared for moderate exercise; scale it down if you're starting from very little activity, because any amount of movement has some health benefit.
| Day | Main session | Daylight tip |
|---|---|---|
| Monday | 35-minute brisk walk | Walk within an hour or two of sunrise if you can |
| Tuesday | Strength training, 25–35 minutes: squats, push-ups (wall or knee versions are fine), backpack rows, lunges, glute bridges | Train near a bright window, and take a 10-minute brisk walk outside |
| Wednesday | 35-minute brisk walk or jog, with a few faster stretches if you feel up to it | Morning or lunchtime outdoors |
| Thursday | Yoga or a stretching flow, 20–30 minutes | A 15-minute brisk walk outside at lunch |
| Friday | Strength training, 25–35 minutes | Same as Tuesday |
| Saturday | A longer walk or hike, 45–60 minutes, ideally with a friend or a group | Go out during the brightest part of the day |
| Sunday | Rest, or an easy 20–30 minute walk | Get outside for at least a few minutes |
Monday through Saturday adds up to about 150 to 165 minutes of brisk walking or jogging plus two strength days, which meets the guidelines; Sunday's walk is a bonus. Some ways to make it stick when it's dark and cold:
- Schedule it like an appointment. Low motivation is a symptom, not a character flaw. Decide the day before when and where you'll walk, and lay out your layers and shoes.
- Use a "minimum version." On bad days, commit to 10 minutes and allow yourself to stop there.
- Build up the effort gradually. Harder sessions helped more in the BMJ review, but you don't need to start there. The CDC's rule of thumb: in moderate activity you can talk but not sing; in vigorous activity you can't say more than a few words without pausing for breath.
- Add people. Social withdrawal is a hallmark of winter-pattern SAD. A walking partner, a class or a running group gives you a reason to show up.
- Have an indoor backup. For ice, extreme cold or dark evenings, keep a home routine ready, like the bodyweight sessions in our indoor workouts guide. If you walk in the dark, wear reflective gear or a light.
- Keep sleep and wake times steady. Oversleeping is a common winter-pattern symptom, and a regular wake-up time also makes a morning walk easier to protect.
If you want more ideas for mood-focused training, see our overviews of the best workouts for mental health and running for stress, anxiety and mood.
When to get help
Depression is a medical condition that deserves proper care. Talk to a doctor or a mental health professional if:
- Low mood, loss of interest or low energy lasts most of the day, nearly every day, for two weeks or more (the time frame NIMH uses for diagnosing depression), or keeps getting worse.
- Symptoms are getting in the way of work, school, relationships or taking care of yourself.
- You've had a similar slump in previous winters (NIMH notes that starting treatment early may prevent an episode).
- You're sleeping or eating much more or much less than usual, or using alcohol or drugs to cope.
- You have depression or bipolar disorder and notice symptoms shifting with the seasons.
If you're thinking about suicide or feel unsafe, get help now. Call or text 988, or chat at 988lifeline.org, to reach the 988 Suicide & Crisis Lifeline. It's free, confidential and available 24/7, including for people worried about someone else. If someone is in immediate danger, call 911. To find local mental health treatment, you can use FindTreatment.gov.
FAQ
Can exercise replace light therapy for SAD?
The evidence doesn't support that. The SAD-specific exercise trials are few, small and short, so treat exercise as an addition to light therapy, CBT-SAD or medication, not a replacement.
Is it better to exercise in the morning for seasonal depression?
No trial has settled the best time to exercise for SAD. Morning is when light therapy is usually done, and a one-week study found a daily morning walk outdoors helped people with SAD. If mornings don't work for you, exercise whenever you'll actually do it, and try to get some daylight early in the day.
How soon will exercise help my mood?
According to the CDC, some brain-health benefits, such as reduced short-term feelings of anxiety, start right after a session of moderate-to-vigorous activity. Changes in depressive symptoms were measured over weeks in the trials above (from 1 to 8 weeks in the SAD-related studies). If you're not feeling better after a few weeks of regular activity, or you're getting worse, talk to a provider.
This article is general information, not medical advice. Exercise can support mental health, but it doesn't replace care from a qualified health professional.
Sources
- National Institute of Mental Health: Seasonal Affective Disorder (NIH Publication No. 23-MH-8138, revised 2023).
- National Institute of Mental Health: Depression (diagnosis time frame).
- Noetel et al., Effect of exercise for depression: systematic review and network meta-analysis of randomised controlled trials, BMJ 2024 (full text).
- Rothenberg et al., Lifestyle modification as intervention for seasonal affective disorder: a systematic review, Journal of Psychiatric Research 2024.
- Pinchasov et al., Mood and energy regulation in seasonal and non-seasonal depression before and after midday treatment with physical exercise or bright light, Psychiatry Research 2000.
- Wirz-Justice et al., "Natural" light treatment of seasonal affective disorder, Journal of Affective Disorders 1996.
- Partonen et al., Randomized trial of physical exercise alone or combined with bright light on mood and health-related quality of life, Psychological Medicine 1998.
- Leppämäki et al., Randomized trial of the efficacy of bright-light exposure and aerobic exercise on depressive symptoms and serum lipids, Journal of Clinical Psychiatry 2002.
- Golden et al., The efficacy of light therapy in the treatment of mood disorders: a review and meta-analysis of the evidence, American Journal of Psychiatry 2005.
- Pjrek et al., The efficacy of light therapy in the treatment of seasonal affective disorder: a meta-analysis of randomized controlled trials, Psychotherapy and Psychosomatics 2020.
- HHS Office of Disease Prevention and Health Promotion: Top 10 Things to Know About the Second Edition of the Physical Activity Guidelines for Americans.
- CDC: Benefits of Physical Activity.
- CDC: Measuring Physical Activity Intensity (talk test).
- 988 Suicide & Crisis Lifeline.
- FindTreatment.gov (SAMHSA).
