Somewhere I heard that doing some physical exercise can help de stress and focus on other work. Is this true? What are the reasons behind this?
Exercise will not increase intelligence. However, I can tell you from my own expierience that if you are a consistent exerciser that it definitely increases the conditioner's focus. When I started lifting in high school, I noticed my grades increased drastically and my attention span during class was much longer. Sure, some could call it coincidental but I noticed when I took a 2 month break my grades dropped a little lower. Is that a coincidence? Not only that, but side effects of exercise consist of: Longer life span(extends it 5-10 years) Optimism Self-Confidence and courage Self-respect Respect from others Strengthens bones Strengthens muscles Improves fitness level Sense of self-accomplishment Lets you contact your inner self(better meditation) Opens new doors
If you were to swap occasional for regular, then this earlier answer of mine may answer you question:
"There have also been numerous studies that show a neurobiological effect / benefit of physical exercise, to quote wikipedia:"
People who regularly participate in aerobic exercise have greater scores on neuropsychological function and performance tests. Examples of aerobic exercise that produce these changes are running, jogging, brisk walking, swimming, and cycling. Exercise intensity and duration are positively correlated with the release of neurotrophic factors and the magnitude of nearly all forms of exercise-induced behavioral and neural plasticity; consequently, more pronounced improvements in measures of neuropsychological performance are observed in endurance athletes as compared to recreational athletes or sedentary individuals. Aerobic exercise is also a potent long-term antidepressant and a short-term euphoriant; consequently, consistent exercise has also been shown to produce general improvements in mood and self-esteem in all individuals.