Clinch fighting
Clinch fighting or trapping is the part of stand-up fighting where the combatants are grappling in a clinch, typically using clinch holds. Clinching the opponent can be used to eliminate the opponent's effective usage of some kicks, punches, and melee weapons. The clinch can also be used as a medium to switch from stand-up fighting to ground fighting by using takedowns, throws or sweeps.
Clinch fighting is emphasized in both striking martial arts, such as Kun Khmer, Muay Thai, Lethwei, Boxing, and Sanda, as well as grappling martial arts, such as Wrestling, Judo, Sumo, Sambo and Brazilian Jiu-Jitsu.
In combat sports
Clinch fighting is the primary focus of many combat sports such as wrestling and it is also a fundamental part of amateur wrestling, sambo, Muay Thai, Lethwei and mixed martial arts. The nature of the clinch during fighting depends on the rules involved in the different sports. Muay Thai puts much emphasis on strikes from the clinch, while judo focuses on throws. The rule common to all these forms is the allowance for the grappling necessary to form a clinch. Other combat sports like boxing or Taekwondo only allow clinching for a short time or do not allow it at all. If clinching is disallowed, the clinching fighter will be issued a warning, or the referee will restart the fight from a distance.File:石井と鈴木.jpg|thumb|left|200px|Grip fighting in the clinch and especially throwing is the primary focus in judo.
Grappling techniques
The clinch is a powerful tool for grapplers to advance into a dominant position in ground fighting, or is used for scoring points or winning a match such as a grand amplitude throw in amateur wrestling or an ippon in judo. The type of techniques employed are heavily dependent on whether or not the participants are wearing clothing heavy enough to be grabbed and used to gain leverage or unbalance them to set up throws. In competitive environments examples of such clothing would be the Dalian,Judogi, Brazilian Jiu Jitsu gi or the Kurtka.In competition where such clothing is being worn there is a strong emphasis on grip fighting where the fighters will attempt to gain a dominant hold on the opponent's gi to unbalance and throw them. Examples of such competition would be judo, sambo or some Brazilian Jiu Jitsu competitions although in BJJ there is frequently a division for both gi and no-gi competition.
In no-gi competition getting double underhooks is generally considered advantageous, as the position can be used to perform throws or takedowns. Being behind the opponent in such a position is known as getting the back, and is generally considered even more advantageous, since it is harder for the opponent to defend from that position. A typical example of a technique that can be performed from this position is the suplex.