Bottom 2 pack...?

I am extremely athletic, and in great shape. But because sports go in seasons, i always have down time and i gain a bit of fat on off time. i have my top 4 pack, you can see them clearly if i flex a little bit, but my bottom 2 i've never been able to get the fat off. what should i do? i drink lots of water everyday, once a week i drink a redline and swim and sprint on my own time. i only eat what i need to stay non-hungry and dont eat junk food often.and im starting to drink green tea. im not looking to develop my bottom abs, just get them noticable. thanks.