First off, I really can't agree with those who say just because someone is big means they are lazy. I am sure some are, but I am sure some aren't. Tony Gwynn said in an interview once that one season he came back from the offseason 30-40 lbs lighter than normal because he wanted to "get in shape". He said he had the hardest time in his career hitting the ball because he felt he didn't have a good base anymore. This is just one person and one case, but guys like Sabathia are HUGE guys. 6-7 and 290 lbs. Adam Dunn is a huge guy, 6-6 and 275 lbs. However, I wouldn't think it was much of a stretch at all to think that their body fat percentage is less than a whole lot of people on this forum who are under 200 lbs.
Now, somewhat back on topic. From what I have heard, Andruw Jones is pretty darn lazy when it comes to preparing for baseball. He supposedly loves the clubs and the night live and moving to LA hasn't helped him much in that department.