Objective. To study overweight and aerobic fitness among children in the third and fourth grades of elementary schools in a city in the United States of America (El Paso, Texas) and a city in Mexico (Chihuahua, Chihuahua) Child, anthropometry, obesity, physical fitness, Mexico, Mexican Americans. ABSTRACTWhile the impact that a healthy lifestyle has on coronary artery disease, obesity, and type 2 diabetes is well documented, that knowledge has not led to substantial changes in diet and physical activity in the United

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