What is Kyorugi
"Kyorugi" has quite comprehensive implication in it. Kyorugi means not only sparring but also a sort of real fighting. But in most cases it means the sparring or competition. The original implication of Kyorugi is to measure the opponent's power with your own technique.
Kyorugi is a dialogue. I mean it is not monologue. It is very easily consented by almost people, but actually most people don't train themselves based on this principle. If you focus on and are interested on the shape and imaginational meaning of Taekwondo motions, you are doing not dialogue but only monologue. (Refer to a part of TKD poem)
In a dialogue, you should consider your partner and the flow of talking with emotional aspect, too, along the rational structure of discussion. The situation is complex in dialogue. Since it is complex situation you should know how to control it easily, and it is why you should know invisible things of it.
Since kyorugi is a dialogue and it is the center of Taekwondo, invisible things are more important than visible. But we can find a good reason why people don't talk or think of the invisible things of Taekwondo or kyorugi. Invisible things are invisible, so it is difficult to see them. And so, it is more difficult to systemize them in our thinking. It is why, though there are many comments on some invisible things on Taekwnodo, it is really difficult to find a systematic discussion of them. But you can see a case of this rare try in The Philosophical Principles of TAEKWONDO. Another more detailed interpretation will be On Samjae and Kang-yu.
The central significance of Taekwondo training is to see these invisible things. It is also a wisdome, too. So you should learn Kyorugi in Taekwondo. I have a reason why I emphasize you should train it. Many people don't try it and sometimes they try to avoid it.
The first thing beginners have to overcome in kyorugi is fear. Particularly the irrational fear. You are safe in enough in kyorugi with protectors and rules, and you also have a good reason why you should do it, but you fear it so that you want to avoid it. And we can find such a case often in our lives; the irrational fear that stops constructive challenge. If kyorugi you should foster your own spirit to fight back it.
Then you should learn to see the invisible things and how to control whole situations with them. It cannot be explained in simple words. You might get some clues of how to do it in this site, I hope. (Main elements of Taekwondo)
To make a conclusion, kyorugi is the center of Taekwondo training, where you can see and come in touch with the importance of invisible things, so that you must not avoid it in spite of your feas.