People who exercise regularly are used to exerting more strength than normal people, and their muscles are more developed and can bear more daily exertion, so people who exercise regularly have harder muscles.
But some sports, such as boxing, require great relaxation. Boxing should be relaxed in punching and moving, even in daily life. Therefore, even if boxers exercise, their muscles will be more relaxed. That is to say, muscles are soft.
Then talk about the quality of hard and soft. Hard muscles are actually exerting strength at ordinary times. In this case, it is easier to maintain muscles without training for a period of time. Of course, this is easier to maintain than soft muscles. As long as you don't practice, muscle loss is certain, and the gods can't save it.
Soft muscles are more suitable for technical sports, such as boxing, such as all kinds of fighting, including your instinctive reaction to dangerous things. Soft muscles can also better listen to the wisdom of the brain. If you suddenly get punched by the opponent and your muscles are weak, you may make defensive counter-attacks and other actions, but if your whole body muscles are tense, you can't do anything.
Then answer the phenomenon you said:
1, the muscles of the construction site and healthy friends may not be both hard and soft, but there may be no physical labor in the daily work of fitness around you, so he has less opportunities to exert his strength with muscles, and he tends to exert less strength, but this does not conflict with what I said earlier. He is more sure about his muscles than someone who doesn't exercise in the same office. The daily physical labor on the construction site is mostly used to exert strength, so the muscles remain tense.
2。 Which is better, soft muscle or hard muscle? Soft muscles are better than hard muscles in explosiveness and flexibility, just like you said, but it doesn't mean that soft muscles are necessarily good. Explosiveness and flexibility are not the whole exercise. For example, for people who exercise, keeping their muscles tense every day is of great benefit to maintaining muscle mass and preventing injuries during training. what would you like to see？ For example, boxing, then your whole body muscles are hard, which must be expensive. The fitness level in our gym is also very high, but if he learns boxing first and then works out, he knows how to relax his muscles, so his muscles are soft and will not affect boxing too much. However, if he doesn't know how to relax when building muscles, it is basically difficult for him to have a high-level boxing performance and his progress will be slower.
3。 Soft muscles can be called living muscles and hard muscles can be called dead muscles, but this is just a statement. The so-called dead muscle does not mean unhealthy, low sports performance and other shortcomings. So many people spray the word "dead muscle" because it is a bit insulting. You'd better not say that.
Moreover, in some occasions, such as martial arts, it is often said that fitness is a dead muscle, and you can't fight or practice muscles. This is ridiculous. It won't do any harm to practice muscles, provided that you learn to relax first.