Generally, commuting is only 5 kilometers, and the legs will not get thicker. Even after riding for a year, the legs will not change (muscles will not get up and excess fat will not be eliminated). Ride 20 kilometers a day to reach a certain average speed, such as 20 miles. After riding for several months, the muscle groups of thighs and calves will be slightly more obvious, but the legs will not be thick. If you ride a road bike at high speed for a long time in the form of exercise and fitness, your bloated legs will look slimmer (excess fat will be consumed). If you ride a road bike and exercise the muscles of your lower limbs, your legs will become thicker (because you exercise the muscles of your legs)-these are the legs of amateur and professional cyclists.