Various factors can play a part in one's success in arm wrestling. Technique and overall arm strength are the two greatest contributing factors to winning an arm wrestling match. Other factors such as the length of an arm wrestler's arm, 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's sometimes used to prove who is the stronger person between two or more people.