There are few fat athletes in track events. Because running is aerobic exercise, it needs a lot of energy. The preferred consumer goods for human body are protein sugar, followed by fat. After professional training, muscle endurance and liver metabolism have reached a high level. Horizontal muscles of the same size contain more protein, higher muscle density, stronger flexibility and denser blood vessels. The liver transports energy faster and the body is more durable. Generally speaking, delicate muscles are a better natural law. You will find that the thighs and legs of long-distance running are well developed, and the muscle lines of the legs are actually not small. Just like the thin and red cheetah, just like the two thousand horns of Nima, it runs many times faster than the bear scorpion, but the bear's paw can hit the leopard's head, not the more energy you need. ?

Long-distance running will not increase muscle mass, but will increase muscle toughness. And a strong runner will be better than losing weight. Therefore, when choosing athletes at the beginning, we will not choose those big, long-distance runners.

A layman who loves long-distance running answered this question.

In fact, just because we are physically strong doesn't mean we are explosive! Although we run effortlessly for a long time, it only shows that our muscles are stronger than others, but sprint is not the endurance of muscles, but the explosive power of muscles! If our muscles are not explosive, our sprint speed cannot be improved. If you carefully observe sprinters with thick thighs and calves, long-distance runners will get thinner thighs and calves. The fast muscle content of sprinters is much higher than that of long-distance runners. Fast muscles use energy faster and are more explosive. Long-distance running and sprint are contradictory. Long-distance running needs better cardiopulmonary function. Sprints need better leg strength. There are two kinds of human muscles: one is endurance red muscle fiber; The other is white. Muscle fibers. The content of these two kinds of muscle fibers is different from person to person. People with high red muscle fiber content have good endurance, while people with high white muscle fiber content have good explosive power.