First, the landing technology is not good, causing illusion. Some people run on tiptoe, so that their calves will be very tired and feel tight, and they feel that their calves are "growing up". In fact, this is just an illusion. People's basic form is innate, and so is the shape of their legs, which will not thicken immediately because they run a few times. In aerobic strength training, such as dumb gymnastics and barbell exercises, the muscle expansion rate will not exceed 20%.
Therefore, in daily running, even if the calf becomes thicker, it will not exceed this ratio, which is almost invisible.
Second, runners think that running has burned fat, so they can eat more, thus gaining weight and thickening their calves. This has nothing to do with running itself.
What kind of exercise causes the calf to thicken? Strength training may be like this. Weight-bearing and heel-lifting exercises can make calves grow muscles, such as men's bodybuilding. The muscles on the calf are difficult to thicken, so daily exercise generally does not cause the calf to thicken.
So, how to eliminate this kind of worry and prejudice?
First, pay attention to the running posture. The correct running posture should be the transition from heel to forefoot.
Second, relax after running. Stretch and relax the calf, friction stretching.
Third, pay attention to running time and speed. The general aerobic exercise time is 20 to 60 minutes. Excessive aerobic exercise will cause muscle fatigue and joint wear. The speed should not be too fast, and the heart rate of aerobic exercise should be controlled within (220- age) × (60%-80%). For example, a 20-year-old man's heart rate during aerobic exercise is 120 ~ 160 beats/min. Fat will stop decomposing in anaerobic state, and will not burn outside the above heart rate range, so the exercise effect cannot be guaranteed.