I think it is fair to assume over the course of a season that a runner hustling from to 1B to 3B or stretching a single into a double or someone backing up a play that isn't part of his defensive responsibilites that can impact the game in a positive manner that would not have occured had he not done it. There's nothing negative that can come from hustling on a play. Except if you expect it from a guy that isn't one of those type of players (Aramis, Manny, Dunn, etc.). Odds are at this point it's going to get them hurt and make them miss more playing time than they would if they didn't "hustle" or "stretch it out" all the time. Players get set in their ways as they get older, especially the ones with very obvious talents. If their talents extend away from having to be a "gamer," often they'll drift away from being that type of payer because they can with minimum negative impact to the rest of the team. Pushing guys like this to suddenly "step it up" when they really don't need to is going to push them out of their set fitness/playing routines and likely make them more at risk to get seriously hurt. So would you rather have Aramis leg out those grounders every now and then or diving left and right and going on the DL more often or have him keep playing like he is and be able to offer his offensive skills to the team? Too many people get on contributing and valuable players for hot "hustling" when the "hustling" isn't what makes them who they are nor would it significantly improve their game or the team around them. It's a superficial expectation better applied to teeball players than to MLB all stars. Especially when you're likely going to push them onto the DL and then we get nothing, hustle or otherwise. When they get older, (to remain healthy) they are expected to adjust their routine to stay in shape as well as prevention of muscle injuries. Think Nolan Ryan had the same workout program at 40 as well as 24? He didn't, his diet and especially his workout programs changed. Players regardless of effort level, have to change it as they get older. Everyone here keeps mentioning Ramirez, doesn't he already have a past history w/leg injuries (muscle)? That tells me something already. If a player gets hurt from hustling more, either it's a fluke injury (Nomar and his groin injury in '05 vs. STL) or there are other aspects he isn't doing right (improving his conditioning, stretching, diet, etc.).