49ers’ undersized Fred Warner has been team’s biggest surprise

Fred Warner played with an aching back and throbbing wrist for most of his freshman season at BYU.
As it turns out, it was more than a bump and a bruise: Warner was tackling running backs with a stress reaction in his lower back that became a full-blown fracture, and fending off blockers with a broken wrist.
How did he do that? The 49ers’ rookie inside linebacker smiled and shook his head after matter of factly detailing his painful season.
“Yeah, looking back, it was pretty crazy,” Warner said. “I don’t even think about it that much anymore — but just talking about it is pretty wild.
Source: Sports