In fact, cycling is the best way to keep the leg muscles symmetrical. You think that the thick legs are the psychological effect of feeling muscle swelling after exercise, not that the legs are really thick. Step by step, gradually increase the exercise time and amount, and the legs will gradually become symmetrical, which requires long-term persistence.

In addition, sprinters often practice explosive power, so they have a lot of large and small leg muscles, which look stronger, while long-distance runners have contact endurance and thin legs. This is also for your reference.