Tumble

You can leave a threatened square without provoking an attack of opportunity from an enemy by tumbling, using Acrobatics. When moving in this way, you move at half speed. If you use an ability, such as charge, which includes movement, you may reduce its speed by half to incorporate tumbling into the ability.
Action Required:	Move action at half speed
DC of Check:	The highest Resilience of any creature you might provoke from, along your path of movement. You roll your Tumble check only once (per move action). Success means you complete your move action without provoking an attacks of opportunity from one creature along your path whose threatened square (or squares) you are leaving. You may choose which creature this is. For each 2 additional points by which you exceed the target DC, you may select another creature along your path to not take attacks of opportunity from. Note that, as this is a single move action, you can only provoke once from each creature that threatens a square you are leaving.
Modifiers to Check	You can move at full speed by increasing the DC of the check by +10. You cannot use Acrobatics to move past foes if your speed is reduced due to carrying a medium or heavy load or wearing medium or heavy armor. You can use Acrobatics to tumble through threatened squares while Prone, but doing so requires a full-round action to move 5 feet, and the DC is increased by +5.
Take 10? / Take 20?	{{{Take10-Take20}}}
Allows Assists?	{{{Assist}}}
Results of Success	{{{Success}}}
Consequences of Failure	If you fail the check, all creatures along your chosen path may make an attack of opportunity against you.
Retry Allowed?	Requires another move action. Retrying does not negate checks which have failed.
Provokes AOO?	That's the whole point, isn't it?