Activity level refers to the amount of physical movement or exercise a person engages in during a specific period. It can range from sedentary, where a person is mostly inactive, to highly active, where they participate in vigorous exercise regularly. Understanding one's activity level is important for maintaining a healthy lifestyle and managing weight. Factors that influence activity level include age, fitness goals, and daily routines. For example, a person with a desk job may have a lower activity level compared to someone who regularly participates in sports or outdoor activities. Tracking activity levels can help individuals make informed decisions about their health and fitness.