The term “resting metabolic rate” (RMR) refers to the number of calories your body burns while at rest, essential for maintaining vital functions like breathing, circulation, and cellular production. It is influenced by several factors, including age, gender, body composition, and overall health. RMR accounts for a significant portion of daily energy expenditure and serves as a critical metric for understanding one's caloric needs. Increasing muscle mass can elevate RMR, emphasizing the importance of strength training in any fitness regimen.