Aggression is of two types:
(a) Hostile Aggression: Hostile aggression is when the main aim is to cause harm or injury to your opponent. For example, a bowler sending a bouncer to distract the concentration of batsman.
(b) Instrumental Aggression is when the main aim in achieving the goal by using aggression. For example, a rugby player using aggression to tackle his opponent to win the ball. The player is not using the aggression to hurt his opponent but rather to win the ball back. Experienced athletes use instrumental Aggression. The player is not having any grudges and shake hands when playing against each other.