Fitness is associated with higher IQ

A large research has found a link between fitness and logical thinking. The study has examined 1.2 million people, according to the results young people who are more physically fit have a higher IQ and are more likely to continue with higher education in their lives.
Higher IQ is associated with a greater capacity heart and lungs, not with greater muscle strength. The capacity of this authority has been linked with both logical thinking skills and linguistic understanding.
"Being in good physical shape also means that you have a healthy heart and lung capacity that allows the brain gets plenty of oxygen. This is probably one of the leading reasons there is a clear correlation between fitness, which favorably affects the heart and lungs, but was not observed in this gym, which delivers only brute muscle power, "explains Professor Michael Wilson, one of the authors of the study.

Scientists have found that this relationship is not the result of genetic, and environmental factors. Or, in other words, it is possible to increase your IQ by improving yourself fit and especially by doing such exercises that strengthen the heart and increase lung capacity.
"We have shown that youngsters who improve their physical fitness between 15 and 18 years are increasing and cognitive capacity. In this regard, physical education is a subject that has a key role in schools and is absolutely essential if we are to do well in subjects such as maths and other theoretical subjects, "added Wilson.

source - Psy Blog