This is unlikely. It doesn't depend on people's physical condition, but on the length of our exercise time. According to experience, you should jog while exercising. As for why you can't run fast? This consumes too much energy, and the meat on the calf will become muscle if it is gone for a long time. Let the body slowly accept the process of physical exertion, so as not to rebound. Of course, this time should be controlled slightly, and it can't exceed 30 minutes at most. It is best after dinner, so that it will not affect the work, but also better maintain the quality of sleep. As for leg soreness, this is normal. If you really can't hold on, divide the time, the first day 10 minutes, the second day 1 5 minutes, so that the calf muscles will not protest slowly. As for running, it has nothing to do with people's fatness. Think of it as fitness exercise! Remember step by step, haste makes waste!