Running does not necessarily make the calves thicker, but running can make the calves stronger. Running is a common form of exercise, through running can exercise the muscles of the legs, enhance the strength of the leg muscles, running can enhance the coordination of the human body, enhance the immunity of the human body, appropriate running is beneficial to the human body. Especially some obese patients need to run and other exercises. Obesity is a risk factor for many diseases, and proper running allows obese patients to control their weight. Obese patients have thicker legs, which is caused by the richness of leg fat content, and running can reduce the accumulation of leg fat, which may make the legs thinner. If the usual lack of exercise, poor physical fitness, the body is relatively thin and weak people, through running can make the leg muscles get exercise, may make the leg muscles become more thick.