Several factors influence caloric needs during workouts, including body weight, intensity of exercise, and duration. Individuals with greater muscle mass typically require more calories due to higher basal metabolic rates. The type of activity also matters; for instance, high-intensity interval training may burn more calories per minute than steady-state cardio. Environmental factors, such as temperature and altitude, can also affect caloric expenditure. It's essential to tailor caloric intake to meet specific energy demands for optimal performance and recovery.