Sure didn't take long for some significant injuries at NFL training camps — Philadelphia Eagles receiver Jeremy Maclin, Baltimore Ravens tight end Dennis Pitta, Denver Broncos center Dan Koppen, to name only three.Washington Redskins linebacker Keenan Robinson (52) left rides a stationary bike during the second day of the NFL football team's training camp in Richmond, Va., Friday, July 26, 2013. The Redskins said Friday that Robinson tore his left pectoral muscle during practice Thursday.Philadelphia Eagles' Jeremy Maclin watches practice from the sideline at the NFL football team's training camp in Philadelphia, Sunday, July 28, 2013.