Prohibited Drills. The following drills are prohibited during preseason, regular season, and postseason “padded” practices:

• (1) Bull in the Ring/King of the Circle
  Defined: Prior to the start of the drill players stand in a circle surrounding one player in the middle. Each player is assigned a number. The drill begins when a coach calls out a number. The player to whom that number was assigned is then required to charge at the player standing in the middle of the circle. Coaches may call more than one number at a time, resulting in multiple players charging the player in the middle.
• (2) Oklahoma Drill
  Defined: Players begin the drill barricaded on each side and lined up directly across from each other. (The players could be a defensive tackle, offensive lineman, ball carrier, and linebacker, or defensive back versus a wide receiver and ball carrier). Upon the start of the drill, players attack each other straight on with no angles. After contact the defender is attempting to shed a block while the offensive player is attempting to create a vertical drive block or a defender attempting to tack the ball carrier runs directly downhill as the ball carrier runs directly through a defender without the ability of either to avoid linear contact due to the barricade on each side with the goal of freeing or tackling the ball carrier.
• (3) OL/DL In-Line Run Blocking/Board-Drill
  Defined: Two players begin the drill by aligning directly across or slightly offset from one another within an artificially confined area, such as between boards, straddling a board or confined by other similar objects or as otherwise indicated by a member of the coaching staff. Upon the snap, players are directed to physically engage with each other off the ball and challenge for vertical push with no attempt by the defensive player to evade the block. The intent of the rule is to prohibit one-on-one tests of strength within artificially confined areas that do not permit the defensive player to angle his approach, shed the blocker, or take other evasive action. This rule does not prohibit or limit one-on-one pass rush or pass protection drills that do not occur within an artificially confined area. (Prohibited during OL versus DL padded practice. Conducting this drill with or without pads and at walking or jogging pace is permitted).
• (4) Half Line/Pods/3-Spot
  Defined: Offensive and defensive line players line up in a partial formational set to practice run blocking. These drills could also include a running back and tight end. (Prohibited during offense versus defense padded practice. Conducting this drill with or without pads and at walking pace or jogging is permitted.)
  
  This rule is intended to prohibit “thud” live, in-line contact where there are no angles for an offensive player to block or for a defender to rush or pursue. The rule prohibits any drill that involves the following:
  • A subset of players (2-on-1; 3-on-2; 3-on-3, etc.)
  • Defensive players are directed to align directly across from offensive players or slightly offset and the offensive player would be instructed to block the defender straight on; and
  • Defensive players are not required to make run/pass reads; they are instructed to overtake the offensive players straight on.
  This rule does not prohibit Clubs from scrimmaging or conducting a drill with a limited number of players if upon the snap of the ball or a whistle being blown, players are instructed to take angles and defenders are instructed to read run/pass as in game situations.

Drills that include the essential elements of the above definitions are prohibited by this Subsection; provided however, that nothing in this Subsection shall be interpreted to prohibit “thud” or “live” blocking, tackling, pass rushing, and/or bumpand-run between or among any number of players during any team period of a Club’s padded practice including, but not limited to, running plays, passing plays, goal-line plays and special teams plays. Any Club that wishes to use a drill that may contain prohibited elements may submit a video of the proposed drill to the NFL for prompt review under the work rules prior to employing it in any practice setting. The NFL will provide a copy of the video to the NFLPA for its prompt review on the same business day. Running any of the above-prohibited drills will subject the head coach of the Club to the sanctions set forth in this Subsection or Article 24, Section 3, as applicable.