this is be cool 8) http://www.trainingfortransformation.ie/index.php/mla-research-paper-order english help online  A strain is a partial tear in a muscle. The quad is a group of four muscles in the front of the upper leg responsible for lower leg extension.They work with the hamstrings on the back of the leg to move the lower leg forward and back. Strong flexible quad muscles are necessary for fast running, so baseball players need these muscles to be flexible and strong to run the bases and chase ground balls or fly balls.