One of the 12 ways featured in  "EFFECTIVE DEFENSIVE DRILLS" ^©
to develop 
excellent muscle memory and outstanding mental disciplines !!!

Move the Attacker Drill
Goal: Teach defensive players to move the attacker to cut off passing lanes.
Description: Position one attacked and one defender in the middle of a 10 X 5 yard playing area. Also place two players at the ends of the playing area for a total of 4 players in all. The ball is passed into play by one end player, who becomes the second defender, to the attacker in the middle. The attacker's object is getting the ball to the other attacker at the opposite end of the playing field. The first defender moves to restrict the attacker's passing option, the second defender quickly moves to cut off further passing chances and help to steal the ball.

Please show me an Effective Defensive Mechanic that tell me how to do a "poke tackle."

Another one of the 12 ways featured in  "EFFECTIVE DEFENSIVE DRILLS" ^©
to develop
excellent muscle memory and outstanding mental disciplines !!!

Slide Tackle Drill
Goal: Teach players safe and effective slide tackles.
Description: Two players, one with a ball, stand side by side 2 yards apart. On command, the players run down the field with the player without the ball attempting to get in position to slide from the side to take the ball away from the player dribbling the ball. The player making the tackle lands on their back pushing the ball away with their outstretched leg. (To avoid injury, make sure to practice this skills on a soft surface. Players only perform this skill only when in a position to make a clean slide tackle.)