No player can perform at peak levels for every season of their NFL careers.
If such a feat were possible nobody would get injured or ever retire (and no Brett Favre doesn't count.)
For the following 10 players, 2011 was a low point in a career otherwise filled with success.
Whether due to injury or poor production, these players simply did not play at the levels they are capable of.
2012 will change that.
It will be an opportunity to return to the elite levels these players have exemplified since joining the NFL.
Let's start with a man only one year removed from an early retirement...