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American football is different than European football, which is called soccer. In the United states, American football is referred to as "football", while in Europe and other parts of the world, soccer is referred to as "football". Being played mainly in the United States and Canada, American football is also famous as "gridiron football".

In this unique sport, two teams of eleven players compete with each other by attempting to advance down the field by running with or passing the ball to score points. The points are scored either by a touchdown or a field goal. The average American football game lasts 3 to 4 hours.

American football 3 Canadian Academy of Sports Nutrition American football 1 Canadian Academy of Sports Nutrition

*See “Energy Systems” under the section of “Sports Nutrition”.
**See “Carbohydrate Loading” under the section of “Sports Nutrition”.
***Your body weight and body metabolism are important elements affecting the average calories you burn during any physical activities. This is the average amount of calories burned by a person with a body weight of 155 Ibs (70 Kg) within one hour of this sport. 
****See “Post – Exercise Rhabdomyolysis” under the section of “Athletic Disorders”.
*****See “Creatine Monohydrate” under the section of “Sports – Performance Enhancers”.
For the “energy paths” of this sport, see the “energy map” below.

 American football 2 Canadian Academy of Sports Nutrition