There is evidence that physical activity improves academic performance, also moderate to vigorous activity before school can help children with attention deficit hyperactivity disorder become more attentive.
The immediate effects are due to the increase in endorphin levels. The increased endorphin levels are proven to boost mood, help ward off anxiety and depression in adults, and improve cognitive function in children with ADHD.
During exercise, the brain releases several chemicals — dopamine, serotonin, and norepinephrine — which are all critical for attention focusing in children with ADHD.
While you may exercise to keep fit, the acute benefits from blowing off some extra steam could also help children in similar ways as current medications, and without the side effects.