If you are so tall, normal is about 100 kg, and slim is about 90 kg! How to lose weight? You can choose jogging, the kind that is super slow. You may be tired in the first fifteen minutes, because you are breathing without oxygen, and then you will be fine. You can try to run slowly to prolong the time. It is not easy to gain muscle if you run slowly. You should run for more than 40 minutes, kick your legs (relax your muscles) after running, and run before and after leg press, so that your legs will be straight!