Aion is one of the few games in which the moves you do actually contribute to your fight. This way the fights become more dynamic and since Aion is a game in which details really count you will want to use this to become a master in PvP.
I am sure that by now all of you saw those yellow arrows, those are the indicators of the movement bonuses, using those moves will give you a specific bonus but will also apply penalties.
Moving Forward:
Bonus:
+10% Physical Damage
+10% Magic Damage
Penalty:
-20% Physical Defense
-20% Magic Damage
Moving Backwards:
Bonus:
+500% to Parry
+500% to Block
Penalty:
-70% Physical Damage
-40% Movement Speed
Left and Right Strafe:
Bonus:
+300% to Evasion
Penalty:
-70% Physical Damage
-20% Movement Speed
This bonuses can come in handy when you are killing something PvP or PvE, for example when a boss use a special skill you can increase your chance to parry or block by moving backwards or strafe to have a higher chance to dodge it.