Here are facts that should get your attention.
How Movement Improves Learning
2 hours of just sitting reduces blood flow, lowers blood sugar, and increases risk of: obesity, diabetes and heart disease. Source
The average U.S. 1st grader spends 943 hours a year in school. Source
Physical activity increases levels of neurotransmitters dopamine and norepinephrine in the same way ADHD medications do.
Neurotransmitters, dopamine and norepinephrine, play a key role in sharpening focus and increasing attention. Source
10 minutes of activity equals an 8% increase in on-task behavior. Source
8 of 9 studies found positive associations between classroom-based physical activity and indicators of cognitive skills and attitudes, academic behavior, and academic achievement; none of the studies found negative associations. Source
11 benefits of increased movement include: increases engagement, better oxygen flow to brain, improves behaviour, develops core strength, improves overall posture, burns more calories, releases excess energy, improves metabolism, improves mental health, higher academic performance, better overall health. Source
The infographic below summarizes this data.