A player can legally bump an opponent when the ball is within five metres.
  1. Lean towards the opponent, pushing hard from the foot furthest from the opponent.
  2. The arm is bent, with the elbow tucked into the side.
  3. Make contact with the shoulder and upper arm — preferably when an opponent is settled on one foot, so he is easier to unbalance.
  4. The bumping player should keep his feet on the ground at all times. 
  5. Only bump when an opponent does not have the ball.
  6. If he does have the ball, apply a tackle.