Defense 101 - On-the-Ball Defensive Techniques
Follow the outline below to learn the essentials and how-to's of playing great on-the-ball defense.  Learn the necessary fundamentals to great team defense!
I.  On-the-Ball Defense Techniques

A.  Stance
1.  Feet approximately shoulder-width apart
2.  One foot slightly ahead of the other -- a straight line drawn from the
    front of back foot should intercept the arch of the front foot
3.  Weight evenly distributed on balls of feet -- heels should not leave
    ground
4.  Knees flexed
5.  Butt down so that chin is directly above the knees (stay low)
6.  Head up
7.  Elbows slightly flexed with arms just outside the body line
8.  Hands positioned with palms up
a.  Hands are used to harass player with ball but head should stay
    up and not dip forward
b.  Hands should move in upward direction when harassing (officials
    are more apt to call a foul if 'slapping down' action is used)

B.  Foot Movement
1.  Feet never touch
2.  Feet never cross
3.  Lateral movement -- defensive shuffle
a.  Step with foot in the direction in which you are going (if you
    are shuffling right, step with the right foot)
b.  Opposite foot is used to push off, kept close to the ground, and
    moved no closer than 12 inches toward the other foot
1.  Do not drag foot
2.  Do not pick feet up in the air
4.  Retreat Step
a.  Pivot on back foot
b.  Swing front leg behind the pivot foot while still facing forward
    (never turn back to the ball)
5.  Diagonal Step
a.  Pivot on foot opposite of the direction the offensive player
    goes (offensive player goes to the left, pivot on the right foot
b.  Swing other foot 60 to 90 degrees by opening up (still facing
    offensive player)
c.  Execute defensive shuffle until offensive player changes
    direction again

C.  Position on Player with Ball
1.  Half-player ahead concept
a.  Try to force offensive player to go in one direction
b.  The up foot in the defensive stance should be outside the foot
    of the offensive person, which is the direction the defensive
    player is trying to take away (Example: if taking away an
    offensive player's right, then the up foot should be outside the
    offensive player's right foot)
c.  Offensive player's foot should point directly between the
    defensive person's feet
d.  Shoulder of offensive player should point directly in the middle
    of the defensive person's body (if taking away right, then right
    shoulder of offensive player intersects middle of defender's
    body)
e.  Offensive player can go in two directions:
1.  If going to the side defender is overplaying, then defense
    swings the up foot in the stance back and shuffles to get
    body in front of offensive player
2.  If going to the side that the defender is not overplaying,
    then defense must shuffle quickly in order to place body in
    front of offensive player
2.  Straight up concept
a.  Defensive player is positioned in a defensive stance to be head-
    to-head with offensive player
b.  Defensive player must be prepared to shuffle in either direction
    in order to maintain position on offensive player

D.  Dictate to player with the ball; be aggressive

E.  Defensive player should be one arm's length away from offensive person
    with the ball

F.  When offensive player picks up the dribble
1.  Defensive person should get up as close as possible to offensive
    person without fouling
2.  Use hands to harass offensive player by following the ball
3.  If offensive player takes ball above the head, then the defender
    brings arms up and crosses them in front of opponent's face

G.  Defense against the shot
1.  Outside jumper
a.  May use one of two methods:
1.  Crowd the offensive player by taking a step toward
    offensive person and extending arms straight up in the air;
    do not leave floor
2.  Jump straight up and extend one arm to contest the shot
    - do not leave floor until offensive player leaves the floor
b.  When contesting a lay-up go after the block with inside arm
    (Example: If lay-up is from the right side, then go after the block
    with left hand)

H.  Concentration point must always be on the mid-section of the offensive
     player
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