Why Exercise Matters for Mental Health
Physical activity is not just good for your body — it is one of the most powerful tools available for mental health. Research consistently shows that regular exercise:
- Reduces symptoms of depression and anxiety
- Improves mood, often producing immediate effects
- Increases energy and reduces fatigue
- Improves sleep quality
- Builds self-esteem and confidence
- Reduces stress and its physical effects on the body
- Helps prevent cognitive decline with age
- May reduce the risk of developing depression
The effects are not trivial. Some studies suggest that exercise is as effective as antidepressants for mild-to-moderate depression, and that its effects last longer after stopping. For anxiety, exercise reduces the physical symptoms that feed anxious thinking.
How Exercise Affects the Brain
Exercise produces a range of neurobiological changes:
- Endorphins — physical activity releases natural opioids that produce a sense of wellbeing and mild euphoria (sometimes called "runner's high")
- Serotonin and dopamine — exercise boosts levels of these mood-regulating neurotransmitters
- BDNF (Brain-Derived Neurotrophic Factor) — exercise increases BDNF, which supports brain cell growth and connectivity, especially in the hippocampus (involved in mood and memory)
- Cortisol regulation — regular exercise helps the body manage the stress hormone cortisol more effectively
- Inflammation reduction — depression is associated with inflammation; exercise has anti-inflammatory effects
How Much Exercise Is Needed?
Health guidelines generally recommend:
- 150 minutes of moderate-intensity aerobic activity per week (e.g. brisk walking, cycling, swimming), or
- 75 minutes of vigorous-intensity activity per week (e.g. running, sport), or
- A combination of both
Plus muscle-strengthening activities (e.g. weights, resistance bands, yoga) on 2 or more days per week.
That said, any movement is better than none. Even 10 minutes of brisk walking has measurable positive effects on mood. If you currently do very little, starting small and building gradually is the right approach.
Types of Exercise and Their Benefits
Aerobic exercise (walking, running, cycling, swimming, dancing)
Most of the mental health research focuses on aerobic exercise. It is the most reliably effective type for lifting mood and reducing anxiety and depression.
Strength training
Growing evidence suggests resistance exercise also improves mood and reduces anxiety. It also builds physical self-efficacy and body confidence.
Yoga
Yoga combines movement with breathing and mindfulness. Research supports its benefits for anxiety, depression, and stress. It is accessible across fitness levels and ages.
Team sports and exercise classes
The social dimension of group exercise adds additional mental health benefits — connection, belonging, accountability, and fun.
Walking in nature
"Green exercise" — physical activity outdoors in natural settings — appears particularly beneficial for mental health. Even brief exposure to natural environments reduces cortisol and improves mood.
Making Exercise Sustainable
The most effective exercise is the kind you will actually do consistently. Tips for building a sustainable habit:
Start where you are
If you have been sedentary, start with 10-minute walks. Gradually increase duration and intensity. Avoid the trap of starting too intensely and burning out.
Choose activities you enjoy
Exercise does not have to be the gym. Dancing, gardening, walking the dog, cycling to work, swimming, rock climbing — all count. Enjoyment is the strongest predictor of long-term adherence.
Make it social
Exercise with a friend, join a class, or find a running group. Social accountability significantly increases consistency.
Build it into your routine
Habit formation is easier when exercise is tied to an existing routine — morning walk before coffee, lunchtime bike ride, evening yoga. Reduce friction by preparing kit in advance.
Plan for obstacles
What will you do when motivation is low, when it is raining, when you are busy? Having a backup plan (shorter activity, indoor alternative) prevents breaks from becoming permanent stops.
Track progress
A simple log of activity — even just a tick on a calendar — builds motivation through visible progress.
Exercise When Mental Health Is Already Low
When depression, anxiety, or low mood is severe, starting to exercise can feel impossible. Even getting dressed can be hard. This is not laziness — it is a symptom of the condition.
Strategies that help:
- Set the bar very low — commit to just 5 minutes. Often you will continue once started.
- Focus on the immediate — you do not need to feel like exercising. Focus on how you will feel in 30 minutes.
- Be compassionate with yourself — missing days is normal. What matters is returning, not perfection.
- Get professional support first if needed — if depression or anxiety is severe, work with a professional who can support you while gradually building activity.
A Note on Exercise and Anxiety
For some people with anxiety, exercise initially increases heart rate, breathing, and physical sensations that feel similar to anxiety or panic. This can initially feel alarming. Over time, however, regular exercise teaches your body and brain that these sensations are not dangerous — a process called interoceptive exposure. Starting with lower-intensity activities (walking, swimming) can help if vigorous exercise feels triggering.
Getting Support
If you want support building physical activity into your mental health recovery, our counsellors at Seeds of New Beginnings can help you develop a sustainable plan that fits your life and goals.