It takes 2 months after a fracture for the fracture to achieve initial healing. Running is a sport with a high exercise load, so it is recommended to run after the fracture is firmly healed. The time between the initial healing of the fracture and the firm healing of the fracture is generally 2-3 months, so in general, the time between the fracture and the ability to run should be at least 3-6 months. It is necessary to analyze the specific situation, and the doctor needs to examine and judge when the fracture is firmly healed before the running exercise can be carried out. For example, the healing time of children and adolescents fractures is very short and heals very fast. For green branch fractures of the upper limbs, running exercises may be possible in more than 1 month or 2 months. In elderly people, if the fracture is in the lower limb, the healing time is longer and slower, and it often takes more than half a year to do running exercise. So how long after the fracture can run, to specific analysis, fast more than 2 months, slow to more than six months, to the regular hospital to find a doctor for examination, judgment.