You flip, twist, and turn in the water with grace.  

• Increase your Dexterity score by 1, to a max of 20. 
• You gain swim speed equal to your walking speed, or if you are at least level 10, your swim speed increases by 10 feet.  
• You may hold your breath twice as long before suffocating, and if you start suffocating, you can survive for an additional 2 rounds before dropping to 0 hit points.