In "competitive arm wrestling", as sanctioned by the United States Armwrestling Federation (USAF), arm wrestling is performed with both competitors standing up with their arms placed on a "tournament arm wrestling table". Arm wrestling tournaments are also divided into weight classes as well as left and right-handed divisions. Furthermore, strict rules such as fouls given to penalties (such as the competitor's elbow leaving a matted area where the elbow is meant to remain at all times, or a false start), and trying to escape a possible arm pin by breaking the grip with the opponent may result in a loss at the table. Paraphrasing USAF rules, arm wrestlers must straighten their wrists without a time lapse of one minute during competition.