Many things can play a part in a player's success in arm wrestling. Skill and overall arm strength are the two greatest contributing things to winning an arm wrestling match. Other things such as the length of an arm wrestler's arm, his/her muscle and arm mass/density, hand grip size, wrist endurance and flexibility, reaction time, as well as countless other traits, can add to the advantages of one arm wrestler over another. It is sometimes used to prove who is stronger between two or more people.