Cycling does not necessarily make the legs thicker, cycling is a very healthy way of exercise, cycling can make the leg muscles to be exercised, so as to enhance the strength of the muscles, but also can enhance the coordination of the human body. Proper exercise can increase one’s lung capacity, enhance the physical fitness of the human body, but also enhance the resistance of the human body, can prevent the occurrence of disease. Some obese patients, due to more fat in the legs, the legs will be thicker, proper cycling can burn fat, weight control, which can make the legs thinner, and can make the body more proportional, so if the obese patients want to lose weight, cycling is also a very good choice. Normally, people who ride bicycles properly may make their legs stronger, and there is a possibility that they may become thicker properly, which are all normal.