there's a reason for that. Look at the positions on a baseball field then look at the race of the players that play them. Like in football, baseball also has positions where there is more running required than the others. In football, those positions would be the cornerback, running back, saftey and wide receivers. Look at what race of player dominates those positions...
In baseball, the positions that require all the running are up the middle: Center field, shortstop and 2nd base are responsible for more space than anyone else on the field. Now look at what race of people dominates at those positions. Then take a look at what positions required almost no running whatsoever: First base, third base, pitcher and catcher. And to a lesser extent, the corner outfield positions. What race of people dominate at those positions??
The positions that the white guys dominate at require far less running (and hustling) than the positions that the black and latino players dominate at. You wanna see a few white guys dogging it, look for the one who are playing outfield spots. Especially the ones who are known to have "great" throwing arms