CBS RENEWS “TOUGH AS NAILS,” THE COMPETITION SERIES CELEBRATING HARDWORKING, EVERYDAY HEROES, FOR SEASONS THREE AND FOUR The Second Season Finale of “Tough As Nails” Airs Tonight, Wednesday, April 14, 8:00-9:00 PM Casting for the Upcoming Seasons is Underway – Apply Here CBS announced today that TOUGH AS NAILS, the reality competition series celebrating hardworking Americans …