Penny retires

This is really strange. RB with only 6 years in the league. 28 yrs old (I think..). He's acting like he has lost all interest. There is no "dawg" there. Something about not feeling like he could perform up to standard..??  Unless he has suffered a bad injury and is "worried", I just don't get it...

Gave up. Lost interest. Doesn't want to put the work in.  Oh well, we haven't lost anything...