Steve McNair intended to complete the final three years of his contract with the Baltimore Ravens. He worked hard during the offseason and arrived at minicamp ready to assume his role as the starting quarterback.

His body had other plans.

McNair announced his retirement Thursday, ending a 13-year career in which he was selected co-MVP, led the Tennessee Titans to the Super Bowl and orchestrated the most successful regular season in the Ravens history. He received a standing ovation from his teammates after revealing his decision, then contained his emotions during a hastily arranged news conference.

“Coming out and making this decision, it was hard,” he said. “In your mind, you feel like you can play, that you can still compete. But when your mind and your body are not in accord, it’s not going to work in the National Football League.