When you say you're eating healthily, what do you mean by that? What exactly are you eating and when are you eating it?
If all you have is accumulated fat on your lower abdominal then it's likely going to be resolved by diet. I know some things that would help but it
just depends on what you're eating and exercise habits are now.
So, what do you eat and when do you eat it? How often do you exercise and what types do you do and when?
Now, if it is a muscle issue and not a fat issue, then there are some workouts that may prove beneficial.
Front Squat
Overhead Squat
Power/hang clean
Pull Ups/Chin Ups - Full Movement, no half-ass(Negative and static reps as well)
Bridge and Plank Variations - These are great.
Woodchop Variations Generally,
woodchops focus on the upper abs but it wouldn't hurt to try them if you're not already.
Forward Roll You can use a ball, barbell or wheel.
Dragon Flag(partial shown)
There's probably more I couldn't remember but try something new until you see improvement and keep doing.
The heavy, Olympic style lifts are great but don't go two heavy. I would say about 80% of your 10rep max. 3 sets of 6-8 reps. Make sure and rest
60-90 minutes between each set.
Remember that load progression is important from week to week. You can increase load, reps or sets, or a combination of both. But always be
progressing.
With the other light-weight lifts, you're going to focus on a more metabolically demanding workout. So pick two or three workouts, do 10-12 reps of
one, rest 30 sec, 10-12 of another, rest 30 sec, 10-12 of another, rest 90 seconds, repeat two more times. Interval training does wonders on trimming
fat problem areas.
End your workouts with a bridge or plank for 3 sets/30 second hold.
Honestly though, you might have more luck quicker by adjusting your diet in some way.
Let me know....
-Dev