Objectives: To know about the effectiveness of walking and running in reduction of body fat mass, to know about the better method in reduction of body fat mass and to improve the fitness of the general people and sports person by reducing body fat mass. Subjects: A sample of 30 students between 15 to 17 years were selected from the population by selection criteria and randomly allotted into two groups. Methods: Two groups of 15 each assigned for walking and running with pre and post evaluation of BMI and skin fold thickness and compared. Results: The result shows that Body mass index (BMI) value reduced in walking (0.78) and running (0.74)groups. Percentage of body fat reduced in walking (4.66%) and running groups (2.94%). When comparing the effectiveness between walking and running group, higher significant level seen with the walking group (0.001) than running group (0.01). Conclusion: Walking and running reduces the body weight and both can be prescribed to the healthier younger individuals to reduce body weight as fat mass.