Introduction:The purpose of the present study was to find out the effect of four weeks Aerobic exercise training on body mass index and vital capacity in male student. Aerobic means -with oxygen -and refers to the oxygen in the body's metabolic process. Aerobic exercise programme such as on spot marching, hopping, running, walking, bicycling and jogging exercises for weight loss and vital capacity. There are many benefits for health and well-being to gain from regular aerobics exercise. Methods: For this purpose ten obese male students were selected randomly from Pt. Kundanlal Shukla Mahavidyalaya, Kanpur Dehat (U.P). The subject's age ranged between 18 to 25 years. Their Body mass index ranged between is 25-29.9. Data were collected before and after four weeks aerobics exercise training programme. To find out the significance difference between pre and posttest means score of body mass index and vital capacity. Data collected from the subjects was statistically analyzed by‗t' test. Result and discussion:The result of the study showed that there was significant difference between pre-test and post-test ,as the calculated value of body mass index and vital capacity respectively (2.92*, 4.83*) was found more than the tabulated ‗t' value (2.26) at level of significance. The training was more effective for the subjects and the study confirmed that the effect of aerobic exercises has played a significant role in weight reduction of obese male as well as vital capacity. Conclusion:The Aerobic exercise has beneficial effects on Body Mass Index and Vital Capacity. It is help for obese male students to loss of weight and improvement of the vital capacity.

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