Spry (3.5e Trait)
From D&D Wiki
You're unusually quick and agile for your race, but not the sturdiest bloke around.
Benefit: You gain a +1 bonus on all Dexterity checks and a +10 bonus to your movement speed.
Drawback: You suffer a -1 penalty on all Strength ability checks. Prerequisite: Only medium races with a land speed of 30 or slower can take the Spry trait.
Roleplaying Ideas: Spry characters tend to be quirky and quick to action, dodging out of the way or hiding behind their more brawny companions, for they know that when trouble rears its ugly head, they'll be in dire trouble if they find themselves on the wrong end of an enemy's beatstick!