Running does not necessarily make the chest smaller, for the chest caused by obesity, running has a certain improvement effect. If it is due to glandular hypertrophy, macromastia and other conditions caused by large breasts, running generally does not play a role in the effect of making breasts smaller. 1. It will make the chest smaller: a small number of people due to their own obesity, the body fat content is higher, in which the breast fat content will also increase accordingly, resulting in chest hypertrophy. Running is conducive to burning fat, play a better weight loss effect, when the fat content of the chest is reduced, the chest will become smaller. 2. It won’t make the chest smaller: if the patient is due to macromastia, genetic factors, glandular hypertrophy and other conditions caused by chest enlargement, running can’t improve the symptoms, it can be improved by other methods. For example, chest hypertrophy can be improved through liposuction surgery, if accompanied by glandular hypertrophy, in the liposuction surgery at the same time, the glands should also be removed, to achieve the effect of thinning the chest. Running may not be effective for every patient, and it is recommended that patients with large breasts seek medical attention in a timely manner and follow the doctor’s instructions.