Basal Metabolic Rate (BMR) represents the minimum amount of energy, measured in calories, that an individual's body requires to maintain basic physiological functions while at rest. These functions include breathing, circulation, cell production, and maintaining body temperature. BMR is influenced by several factors, including age, gender, weight, height, and body composition.

BMR serves as the foundation for determining daily calorie requirements and is a key component in various health and fitness assessments. Understanding one's BMR can aid in designing personalized nutrition and exercise plans to achieve specific health and fitness goals, such as weight management or muscle gain, by ensuring appropriate calorie intake and expenditure.