Nothing.
No there is not
A offensive player can terminate a play at anytime by surrending and not advancing
No, that rule has been in college football for a long time but has never been adopted by the NFL.
The current ruling on the NFL horse collar rule prohibits defenders from grabbing the inside collar of the back or side of the shoulder pads or jersey of the runner and immediately pulling them down. This rule was implemented to protect players from serious injuries, such as knee and ankle injuries, that can occur when a player is forcefully pulled down by the collar. The rule has helped improve player safety in the league by reducing the risk of these types of injuries.
No they RULE!
The NFL hands to the face rule prohibits players from using their hands to make contact with an opponent's face mask or helmet. This rule is in place to protect players from potential injuries, such as concussions or neck injuries, that can occur from such contact. Violating this rule can result in penalties and fines, impacting gameplay by potentially giving the opposing team an advantage and affecting player safety by reducing the risk of serious injuries.
NFL player Robert McClain played for Connecticut.
To the owner
The weakest NFL player is Ray Lewis
NFL player Charles Woodson played for Michigan.
the nfl started in 1936 and the first player was Jay Berwanger
NFL player Michael Floyd played for Notre Dame.