Diabetes is related to the impaired glucose tolerance of the body, where insulin functioning is affected. The beneficial effect of the practice of Yoga and other exercises like Aerobic Training on diabetes includes direct influence on pancreatic secretion by rejuvenation of the pancreatic cells, through alternate abdominal contractions and relaxations, during asana The purpose of the study was to find out the effects of yoga and Aerobic Training on selected biochemical variables blood sugar and Glucose Tolerance among diabetic patients. To achieve this purpose, sixty men patients who were not involved in any vigorous physical training programme, age ranging from 35 to 45, undergoing treatment for hypertension and type-II diabetes mellitus, were selected from in and around Pettai, Tirunelveli city. The selected subjects were divided into three groups at random with 20 each. Twenty patients in each category (type II Diabetes and Hypertension) would serve as control group and the remaining forty would undergo systematic Yoga training and Aerobic training in the department of physical education and sports sciences, under the supervision of physician, The M.D.T Hindu College, Tirunelveli. The control group did not undergo any special training programme. The remaining subjects constituted an experimental group who underwent Yoga and Aerobic Trainig Programme. The selected subjects were medically examined by a qualified medical person for undergoing the training programme Analysis of data using ANACOVA showed that there were significant difference between experimental groups and control group on selected variables blood sugar and oral glucose tolerance. The significant improvement in the above said variables highlights the effect of aerobic training and yoga training design for this study, its systematic progressive loading pattern and appropriate recovery phase between sessions during the training period. The control group did not participate any kind of training programme specifically for improving the selected variable