It is essential that the tackler and the first supporting defender know 
their roles, responsibilities and the Laws (and crucially the difference between a 
stand-up 1-on-1 tackle and a tackle on the ground). The tackler must track the 
inside shoulder of the ball carrier and take his space; he needs (a) quick footwork 
with a strong square hip base; (b) the front foot forward and close to the ball 
carrier, low body height and eyes on the target area; and (c) hit, stick, squeeze 
and chase the feet as the shoulder makes contact. Decision-making on what type 
of tackle is needed is also important. The first supporting player must know as 
much as possible about his entry to the tackle area; if the ball is not visible, he 
must attack the body or legs; if the ball is visible he must ‘target the ball’, either 
looking for a turnover or to slow it down (legally!).