José Luis Trejo: Outdoor Exercise Beats Gyms for Brain Health

Neuroscientist José Luis Trejo argues that natural outdoor environments provide superior cognitive stimulation compared to gyms or indoor spaces when exercising. In recent research and interviews, Trejo emphasizes that consistent, moderate physical activity significantly boosts brain health and neuron generation while warning against the stress of overtraining.

Why the Great Outdoors Outperforms the Gym for Your Brain

When it comes to working out, modern fitness culture often glorifies the enclosed, mirrored walls of the local gym. But neuroscientist José Luis Trejo challenges that conventional setup, pointing out that doing exercise outdoors in natural surroundings offers a far richer cognitive stimulus than working out indoors.

According to research into the effects of physical activity on the brain, walking, running, or cycling through parks, beaches, or tree-lined paths combines physical movement with a constantly changing array of colors, sounds, and smells. While the body stays active, the brain processes this shifting sensory landscape.

Outdoor urban environments still provide more variable stimuli than a static indoor facility, but nature remains the ideal setting. Trejo explains this dynamic during a conversation featured by the project Aprendemos Juntos 2030, noting that running moderately tells the brain: ‘I am active and, furthermore, processing new information.’

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The Danger of Overtraining and the Fallacy of Maximum Effort

Physical training often adopts the motto No pain, no gain or its Spanish equivalent, Sin dolor no hay beneficio. However, Trejo cautions that pushing the body to absolute exhaustion yields very different results for neurological tissue than it does for skeletal muscle.

While muscles adapt and strengthen when pushed close to their physiological limits, the brain does not operate under the same rules.

When you bring the brain to failure, the only thing there is failure. José Luis Trejo, Neuroscientist

Excessive fatigue introduces chronic stress, which can actively reverse the cognitive gains earned through movement.

Fueling New Neurons Through Consistent, Moderate Movement

As a researcher at the Cajal Institute of the Spanish National Research Council (CSIC) in Madrid, Trejo explores how physical activity acts as a biological necessity rather than an optional hobby. In his published work titled Neuronas en marcha, he details how movement increases synaptic and mitochondrial efficiency while triggering neurogenesis in the hippocampus.

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Every type of exercise is useful to produce benefits in the brain, what is important is not the number of days per week, but regularity. José Luis Trejo

Moderate exercise sessions distributed throughout the week provide powerful antidepressant and anxiolytic effects, protecting mental health without the side effects associated with pharmaceutical interventions. Moreover, Trejo notes that even working out entirely alone at home remains infinitely superior to remaining inactive.

Ancestral Habits Versus Modern Sedentary Realities

Modern society faces a dual crisis of widespread sedentary behavior and obsessive workout extremes. Trejo connects current lifestyle ailments to human evolutionary biology, pointing to the endurance strategies of early humans and indigenous groups.

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Describing the persistence hunting methods historically used by Bushmen, Trejo explains how humans leveraged superior neurological cooling capacities to track prey across open savannas for hours until the animals collapsed from exhaustion. Unlike modern daily chronic stress, ancestral movement was balanced by periods of rest and recovery once food was secured.

To help individuals gauge safe exertion levels without expensive laboratory testing, Trejo outlines a practical method in his book: the talk test rule, which allows anyone to calculate their optimal heart rate threshold simply by monitoring their ability to converse while active. Whether opting for a brisk walk through city streets or a quiet trek through a forest, the scientific consensus emphasizes that breaking daily sedentary habits takes precedence over chasing fitness trends.