Why was Troy Polamalu held out of practice?

By Sid Saraf, FOXSports.com Steelers star Troy Polamalu didn't practice on Sunday. Oh, no ... what happened now? Did he get hurt again? Is it something else? Thankfully, head coach Mike Tomlin cleared up the mystery for us:

"He has a contusion of the birth certificate." - @CoachTomlin on why @tpolamalu got the day off from practice. — Pittsburgh Steelers (@steelers) August 4, 2013

Oh, I see ... he's fine. Just old! Apparently, the Steelers are taking a more cautious approach with the 11-year-vet. Polamalu has missed 22 games since 2009 and appeared in just seven in 2012. As a result, the Steelers are giving him plenty of time to rest and want to make sure the long-haired weapon is at full strength for the start of the season. Makes sense. Meanwhile, check out this video of Mr. Polamalu preaching about the spirituality of shampooing.