TAMPA—Around the Yankees spring training camp, big is beautiful. This is not an exaggeration. The 2011 Yankees are certain to be one of the heaviest teams in baseball history.

The latest episode of "The Biggest Loser: Yankee Edition" kicked off in earnest Wednesday when General Manager Brian Cashman acknowledged that reliever Joba Chamberlain reported to camp well over his listed weight of 230 pounds, to the team's chagrin.

"He's...