The activity of the animal is related to the rate of movement and energy requirements. It is taken into account in feed selection and determines the need for calories, protein, fat and other nutrients. It can vary depending on the age, breed, health and lifestyle of the animal. The range of activity usually includes light activity (for animals spending most of their time at rest), normal activity (for animals with an average amount of exercise) and high activity (for working animals or animals with an increased need for exercise).