News Published: 17 February 1921 A Brief Outline of the Development of the Theory of Relativity A. EINSTEIN Nature 106, 782–784 (1921) Cite this article ...

Regular physical activity is linked to a reduced risk of obesity and chronic disease. African American women bear a disproportionate burden from these conditions and many do not get the recommended ...

Abstract This article examines the incidence and quality of physical activity instruction during early childhood. Although the positive effect of physical activity on the cognitive, social, and ...

Children are also assessed on cardiorespiratory fitness, physical activity, body composition, muscular strength, language and academic development, and mental health.