Sport and mental health

I know I should move more. But between work fatigue, lack of time and demotivation, physical activity often remains low on the list of priorities. And yet, if exercise were a medicine, it would be the most versatile medicine ever discovered: effective against depression, anxiety, chronic stress, sleep disorders, cognitive decline and even some effects of brain aging. According to a meta-analysis published in JAMA Psychiatry (2023) involving 97 studies and more than 128,000 participants, physical activity reduces depressive and anxiety symptoms in a manner comparable to standard drug treatments. The question is no longer whether it works, it's proven. The question is how to integrate it sustainably into my life.

1. Mechanisms: why exercise is a therapeutic tool

The effect of physical exercise on mental health occurs through several well-documented neurobiological mechanisms:

• ●Neurotransmitters: exercise increases the availability of serotonin, dopamine and norepinephrine, the same neurotransmitters targeted by antidepressants. A 30-minute session is enough to observe the acute effects.

• ●Endorphins and endocannabinoids: physical effort triggers the release of endorphins (runner's euphoria) and endocannabinoids (anandamide, endogenous cannabinoid) which reduce the perception of pain and generate a state of well-being.

• ●BDNF (Brain-Derived Neurotrophic Factor): aerobic exercise stimulates the production of BDNF, a neuronal growth factor that promotes neurogenesis (creation of new neurons) in the hippocampus, the area of ​​the brain involved in memory and emotion regulation. This neurogenesis is one of the mechanisms of the antidepressant effect.

• ●Cortisol regulation: regular exercise normalizes the stress response by regulating the HPA (hypothalamic-pituitary-adrenal) axis and lowering the baseline level of cortisol.

• ●Sleep: regular physical activity improves the quality and depth of sleep, a fundamental pillar of psychological balance.

  Disorder or goal	Effect of physical activity	Source
  Mild to moderate depression	As effective as antidepressants (30 min, 3x/week)	Blumenthal et al., Psychosomatic Medicine, 2007
  Generalized anxiety	Significant reduction in symptoms (comparable to CBT light)	Stubbs et al., Psychiatry Research, 2017
  Chronic stress	Basal cortisol reduction of 20-30% after 8 weeks of regular exercise	Traustadottir et al., 2005
  Prevention of cognitive decline	Reduced risk of dementia by 30-35% in physical assets	Livingston et al., The Lancet, 2020
  Sleep quality	Reduced time to fall asleep by 55% and increased deep sleep	Kredlow et al., Journal of Behavioral Medicine, 2015
  Self-esteem	Significant improvement in body image and self-efficacy perceived after 6 weeks	Fox KR., International Journal of Sport Psychology, 2000

2. What the science says: the numbers that make the difference

3. What activity, what intensity, what frequency?

WHO recommendations for adults on physical activity for mental health:

• ●Moderate intensity: 150 to 300 minutes per week (i.e. 30 to 60 min per day, 5 days per week). Examples: brisk walking, cycling at a moderate pace, swimming, dancing. This is the best documented level for benefits on depression and anxiety.

• ●High intensity: 75 to 150 minutes per week. Examples: running, HIIT, intense cycling. The effects on neurotransmitters and BDNF are more pronounced, but the risk of injury and dropout is also higher.

• ●Muscle strengthening: 2 times a week at least. Studies show that strength training reduces depressive symptoms by 33% according to a meta-analysis by Gordon et al. (JAMA Psychiatry, 2018).The good news: Even small amounts of physical activity produce benefits. A 10-minute walk reduces situational anxiety measurably. The important thing is consistency, not performance.

4. How to get started and stick with it: strategies that work

Start ridiculously small. 5 minutes of walking per day for the first week. 10 minutes the second. The brain is not afraid of a tiny goal, and once started, we often achieve more. The enemy of physical activity is overly ambitious goals that trigger procrastination.

Anchor it to an existing habit. Walk after lunch, do 10 minutes of yoga before shower, get off a subway station early. Habit stacking is one of the most effective mechanisms for creating a lasting habit.

Choose a pleasant activity, not an “effective” activity. The best physical activity is the one I actually do. If the gym bores me, I won't keep it up. Dancing, gardening, cycling, hiking, team sports, everything counts, everything is worth it.

Rely on social connections. Practicing with someone else doubles the chances of maintaining the activity. A training partner, a walking group, a group class, the social dimension creates a powerful additional commitment.

Track my mood, not just my performance. Keep a diary of my mood before and after exercise for two weeks. Seeing the correlation between movement and well-being in a concrete way is one of the most powerful motivations to keep going.

5. Physical activity and health prevention assessment

A health check-up is an opportunity to assess my current level of physical activity and its effects on my mental health indicators (perceived stress, sleep quality, mood). A sedentary lifestyle is a recognized mental health risk factor, just like cardiovascular or metabolic factors. Integrating it into the prevention assessment means acting upstream, before the consequences manifest themselves.