Study Goal: is comparing the effectiveness of home-based aerobic exercise training versus supervised aerobic or strength exercise training on metabolic factors in post bariatric surgery patients. Study population and methods: study population will include 90 obese patients who are eligible for bariatric surgery. We’ll measure each patients’ Fasting Blood sugar, High density Lipoprotein, Low Density Lipoprotein, Triglyceride ,HOMAIR, Hemoglobin A1C , physical fitness using 6 minute walk test, as well as muscle strength using dynamometer, before their surgery, 6 weeks post- op, and 3 months after patients participation in either aerobic or strengthening exercise programs. Patients will get randomized to 3 different groups as follow: Group 1: includes 30 patients who will receive conventional therapy, which includes one hour session of training on how to do aerobic exercise, supplemental handbook as a reminder for exercises they are supposed to do as well as a pedometer to keep track of their physical activity . Group 2: includes 30 patients who will receive conventional therapy plus 2 sessions of strength training per week each for an hour under supervision of a Sports Medicine physician Group 3: Includes 30 patients who’ll receive 2 hourly sessions of aerobic exercise per week supervised by a sport medicine specialist in addition to conventional therapy. At the end of the 3 months we’ll re-measure all the metabolic parameters and compare them to the initial values to find out if our intervention by using supervised training make a difference between the values of 3 different groups.