I love Wikipedia:
Tiki Barber
http://en.wikipedia.org/wiki/Tiki_Barber
NFL retirement
In October 2006, Barber revealed his intention to retire at the end of the 2006 NFL season. Barber has previously indicated his desire to retire at some point and pursue a broadcasting career but the news still came as a shock to Giants fans and NFL observers.
Many fans wondered why a player at the peak of his game would retire. Barber cited the toll the physical nature of football takes on a person's body. He also spoke of his keen interest in pursuing a broadcasting career and other opportunities. Rick Reilly wrote a column in Sports Illustrated, that chastised critics of Barber's decision and listed a number of former players who played until they were no longer physically able to and have since endured long-term injuries.
During his career with the Giants, the team never won a championship, a top goal of Barber's that he spoke publicly about in 2005. When announcing his retirement, Barber seemed at peace to leave the game without a Super Bowl ring. He said, "I used to think my career was defined by not winning a Super Bowl. But I think looking back on my career, they'll see someone who was a competitor, someone who always played hard and never gave up."[13] He officially filed his retirement papers with the Players Association on February 12, 2007
The year after he retired, the Giants won Superbowl 42 against the undefeated New England Patriots, 17-14, on February 3rd, 2008. Punch was served.