Korla 1: The Conflicts Beneath
Half-orcs combine the best qualities of humans and orcs, though some would argue that the good qualities of orcs are few and hard to find. From their orc blood, half-orcs inherit great physical strength and toughness. They are fierce warriors, fleet of foot as they charge into battle. ... Their human blood makes half-orcs decisive and bold, resourceful and self-reliant.
—from Player’s Handbook 2
Half-Orc Abilities: Half-orcs are stronger than their human ancestors, while being more nimble and charismatic than their orcish ancestors.
+2 Strength, +2 Dexterity or +2 Charisma