"Pinch runners" are players who are substituted into games solely to run the bases for another player. This strategy is often employed to take advantage of a particularly fast player, or to give a player who is fatigued or injured a chance to rest. There are a number of synonyms and related terms for "pinch runners," including "base runners," "base stealers," "speedsters," and "burners." Additionally, some baseball analysts differentiate between "pinch runners" who are used as strategic substitutions and players who are designated as "runners only," implying that they are not valued for their overall baseball skills but only for their speed on the bases.