Have an ab day, twice per week. In this ab session, do every ab exercise known to mankind. It's often recommended you go to the gym and do the p90x ab workout. Afterall, it's your routine that gives you lean hard abs, and not the diet or bodyfat.
Personal Trainer- ACE, NASM AFPA; Nutrition Consultant- AFPA
"I can do all things through Christ which strengtheneth me." - Philippians 4:13"