Level: 2nd.
Replaces: If you select this alternative class feature, you do not gain the fighter bonus feats at 2nd level and at 6th level.
Benefit: You excel at overwhelming traps, smashing through doors, and pushing aside your enemies. At 2nd level, you gain a +2 competence bonus on saves and to your Armor Class when attacked by traps. You also gain a +5 bonus on Strength checks to break a door, wall, or similar obstacle.
In addition, you gain a special benefit when making a bull rush. If you force an opponent to move into a wall or other solid object, he stops as normal. However, your momentum crushes him against it, dealing an amount of bludgeoning damage equal to 4d6 points + twice your Strength bonus (if any).
At 6th level, the bonuses when dealing with traps increase to +4, and the bonus on Strength checks to break objects increases to +10. The damage you deal when bull rushing an opponent into a wall increases to 8d6 points + three times your Strength bonus.
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Not much on its own unless you're one of those DMs that thinks fighters aren't allowed to have nice things, in which case it's too much. It gets better with the Directed Bull Rush maneuver of the Shock Trooper feat, or with flight and dribbling the opponent off the floor like a basketball.