3e SRD:Spring Attack
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Spring Attack [General]
Prerequisite: Dex 13+, Dodge, Mobility, base attack bonus +4 or higher.
Benefit: When using the attack action with a melee weapon, the character can move both before and after the attack, provided that the character's total distance moved is not greater than the character's speed. Moving in this way does not provoke an attack of opportunity from the defender the character attacks. The character cant use this feat if the character is in heavy armor.