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Body composition describe the amount of fat and and energy in the body .Physical activity tell us how much energy and body is spending in a specific activity where muscles are involved where as BMR (Basal Metabolic Rate) tell us how much body is spending energy in rest to be alive. BMR, physical activity, and body composition they are related to each other with respect to physical movement and amount of energy they consume in that position. All of three help us in determining the amount of energy required by the body
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