Not every kid is built to run all day several times a week, some kids are great baseball players but not long distance runners. Can you picture Sabathia, Pujols, or Panda running just to be running.
Exactly!
A friend of mine was the pitching coach for the Dodgers for a number of years, but before that was a MiL pitcher for 20 years and a scout for almost 10. He is as firm a believer in pitchers running as anyone can find, but he makes it very plain that not all of his pitchers were expected to run the same amount. Don Sutton was one he says would just laugh when told it was time to do more than 1 or 2 short sprints, but Bob Welch would run all day if he was allowed. All he really wanted was for them to strengthen their legs, and if they could do it without running, that was fine with him.