More on Fighting -- Writing Training

While most fiction doesn't take place in a dojo, in my short time practicing martial arts I've seen some interesting interpersonal conflicts that could be used in stories.

1. Masters get old and sometimes fat -- How do you show you are as good as you used to be or come to terms with the fact you are not?

2. People have issues -- How do you deal with people who fight out of control, not staying in the bounds needed to keep training safe? In general, how do you work with people who have trouble with discipline?

3. People have more issues -- How do you deal students, who because of there physical or mental limits, have more difficulty than others?

4. People have varying experience and some people who have experience in other settings or with other martial arts will resent being classed as beginners.