Detroit Lions receiver Calvin Johnson runs through an NFL football organized team activity in Allen Park, Mich., Wednesday, May 28, 2014. (AP Photo/Carlos Osorio)
Atlanta Falcons defensive end Kroy Biermann (71) works with linebackers coach Mark Collins during a NFL football practice, Wednesday, May 28, 2014, in Flowery Branch, Ga. (AP Photo/John Bazemore)
Atlanta Falcons running back Steven Jackson (39) works during a NFL football practice, Wednesday, May 28, 2014, in Flowery Branch, Ga. (AP Photo/John Bazemore)