Walking and cycling are forms of physical activity that contribute to energy expenditure in the body. Both activities engage large muscle groups, increasing the demand for energy. The body utilizes stored energy, primarily in the form of carbohydrates and fats, to fuel these activities. The duration, intensity, and frequency of walking or cycling impact the overall energy expenditure. Regular engagement in these activities can improve cardiovascular health, enhance metabolism, and contribute to weight management. The efficiency and sustainability of energy expenditure through walking and cycling make them valuable components of a healthy lifestyle.