Sparring is a form of training common to many combat sports. Although the precise form varies, it is essentially relatively 'free-form' fighting, with enough rules, customs, or agreements to minimize injuries. By extension, argumentative debate is sometimes called sparring. Differences between styles The physical nature of sparring naturally varies with the nature of the skills it is intended to develop; sparring in a striking art such as Chun Kuk Do will normally begin with the players at opposite sides of the ring and will be given a point for striking the appropriate area and will be given a foul for striking an inappropriate area or stepping out of the ring. Sparring in a grappling art such as judo might begin with the partners holding one another and end if they separate. The organization of sparring matches also varies; if the participants know each other well and are friendly, it may be sufficient for them to simply play, without rules, referee, or timer. If the sparring is between strangers, there is some emotional tension, or if the sparring is being evaluated, it may be appropriate to introduce formal rules and have an experienced martial artist supervise or referee the match. In some schools, permission to begin sparring is granted upon entry. The rationale for this decision is that students must learn how to deal with a fast, powerful, and determined attacker. In other schools, students may be required to wait a few months, for safety reasons, because they must first build the skills they would ideally employ in their sparring practice. Sparring is normally distinct from fights in competition, the goal of sparring normally being the education of the participants. Use and sport The educational role of sparring is a matter of some debate. In any sparring match, precautions of some sort must be taken to protect the participants. These may include wearing protective gear, declaring certain techniques and targets off-limits, playing slowly or at a fixed speed, forbidding certain kinds of trickery, or one of many other possibilities. These precautions have the potential to change the nature of the skill that is being learned. For example, if one were to always spar with heavily padded gloves, one might come to rely on techniques that risk breaking bones in one's hand. Many schools recognize this problem but value sparring nonetheless because it forces the student to improvise, to think under pressure,