Hammer Fist

 
Prerequisite(s): Improved Unarmed Strike, Str 13+
 
Benefit: You may make a single unarmed attack with both hands to add 1-1/2 your Strength bonus on the damage roll. This extra damage does not apply if you make a flurry of blows attack or if you are holding anything in either hand.
 
Special: A fighter may select Hammer Fist as one of his fighter bonus feats.
 
Source: Dragon Compendium