The difference is particularly large. The method of fitness is to live longer every year, so that you can live longer and wear more clothes, and internal strength is an abstract problem. For example, someone asks, is there him in this world? Most people will say that they don't know, but in fact, the design of internal skill does exist, but people just don't understand it, because it is too profound for people nowadays, but now some people in this world know about internal skill, which is only superficial, but if someone asks if they can practice it, then I will tell you that this song can't be picked up randomly, otherwise it will hurt themselves.