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The Positions in a Football Secondary
http://www.dummies.com/sports/football/defense/the-positions-in-a-football-secondary/
Secondary
The secondary is the name given to the group of players on an American football team who make up the defensive backfield. All the players who make up the secondary are called defensive backs, but that category is further divided. In a nutshell, these players are responsible for preventing the opponent’s receivers from catching the ball. If they fail, they must then make the tackle, preventing a possible touchdown. The different players work in slightly different ways.
Cornerbacks
The cornerback is typically the fastest of the defensive backs. The ideal NFL cornerback can run the 40-yard dash in 4.4 seconds, weighs between 180 and 190 pounds, and is at least 6 feet tall. However, the average NFL cornerback is about 5’10”. Although speed and agility remain the necessary commodities, height is becoming a factor in order to defend the ever-increasing height of today’s wide receivers.
Here’s the cornerback’s role in two specific types of coverage:
Cornerbacks in man-to-man coverage: Most defensive schemes employ two cornerbacks (CB) in man-to-man coverage against the offense’s wide receivers (WR). The cornerbacks align on the far left and right sides of the line of scrimmage, at least 10 to 12 yards from their nearest teammate (usually a linebacker or defensive end) and opposite the offense’s wide receivers. The distance varies depending on where the offensive receivers align themselves. Cornerbacks must align in front of them...
http://www.dummies.com/sports/football/defense/the-positions-in-a-football-secondary/
Secondary
The secondary is the name given to the group of players on an American football team who make up the defensive backfield. All the players who make up the secondary are called defensive backs, but that category is further divided. In a nutshell, these players are responsible for preventing the opponent’s receivers from catching the ball. If they fail, they must then make the tackle, preventing a possible touchdown. The different players work in slightly different ways.
Cornerbacks
The cornerback is typically the fastest of the defensive backs. The ideal NFL cornerback can run the 40-yard dash in 4.4 seconds, weighs between 180 and 190 pounds, and is at least 6 feet tall. However, the average NFL cornerback is about 5’10”. Although speed and agility remain the necessary commodities, height is becoming a factor in order to defend the ever-increasing height of today’s wide receivers.
Here’s the cornerback’s role in two specific types of coverage:
Cornerbacks in man-to-man coverage: Most defensive schemes employ two cornerbacks (CB) in man-to-man coverage against the offense’s wide receivers (WR). The cornerbacks align on the far left and right sides of the line of scrimmage, at least 10 to 12 yards from their nearest teammate (usually a linebacker or defensive end) and opposite the offense’s wide receivers. The distance varies depending on where the offensive receivers align themselves. Cornerbacks must align in front of them...