Well, this isn't something I have cooked up. I read it in the news today: "Sich bewegen bringt doppelt Segen" (to take exercise is a double blessing). The article is based on a scientific study carried out in Sweden and claims that sport increases intelligence and slows down aging.
"Cardiovascular fitness is associated with cognition in young adulthood" (2009, abstract, full text). I just copied some of the results:
"During early adulthood, a phase in which the central nervous system displays considerable plasticity and in which important cognitive traits are shaped, the effects of exercise on cognition remain poorly understood. We performed a cohort study of all Swedish men born in 1950 through 1976 who were enlisted for military service at age 18 (N = 1,221,727). [...] Physical fitness and intelligence performance data were collected during conscription examinations and linked with other national databases for information on school achievement, socioeconomic status, and sibship. [...] Cardiovascular fitness, as measured by ergometer cycling, positively associated with intelligence after adjusting for relevant confounders [...] In contrast, muscle strength was not associated with cognitive performance. Cross-twin cross-trait analyses showed that the associations were primarily explained by individual specific, non-shared environmental influences (≥80%), whereas heritability explained less than 15% of covariation. Cardiovascular fitness changes between age 15 and 18 y predicted cognitive performance at 18 y. Cox proportional-hazards models showed that cardiovascular fitness at age 18 y predicted educational achievements later in life. These data substantiate that physical exercise could be an important instrument for public health initiatives to optimize educational achievements, cognitive performance, as well as disease prevention at the society level."So let our young people cycle (to school)!