For obese, I know it is hard to exercise. Jogging is a torture. Do not jog if you think your knees cannot support the pressure of your upper body weight. My suggestion is tackle the weight loss problem through healthy eating first, and less intensity on exercise. Instead of jog, you can just increase the number of steps of walking in a day. If you have access to treadmill, just increase inclination and walk, so you will get the same benefits like running. These kind of exercise is enough and safe for starter. As for eating, this is your main priority. For those who craves for sugar, I know it's tough to just stop from having sweet tooth in each meal. So, my suggestion is, buy Stevia at cosway, it is a type of natural sugar that has better effect than the normal sugar. You can google stevia or youtube, you would be amazed my this superfood.