Mike Shanahan changed his story in a hurry. The new explanation: Donovan McNabb was benched more because of his body, not his brain. Less than 24 hours after declaring he yanked McNabb because of a "gut feel" relating to the quarterback's less-than-full competence in the offense, the Washington Redskins coach instead insisted Monday it was a pre-planned move that had more to do with "cardiovascular endurance" issues. McNabb, because of nagging hamstring and groin injuries, wasn't in good enough shape to run a two-minute offense with no timeouts -- according to Shanahan. "The cardiovascular endurance that it takes to run a two-minute, going all the way down with no timeouts, calling plays, it's just not easy." Shanahan said. "If I thought it was the best situation to do, then Donovan would have run the two-minute offense." Read more: http://sports.espn.go.com/nfl/news/story?id=5753040