One rep maximum (one repetition maximum or 1RM) in weight training is the maximum amount of weight one can lift in a single repetition for a given exercise. One rep maxima can be used for determining an individual's maximum strength and is the method for determining the winner in events such as powerlifting and weightlifting competitions. One rep maxima can also be used as an upper limit, in order to determine the desired "load" for an exercise (as a percentage of the 1RM).