If we were to do a poll and ask men what the hardest body part to train is, we're confident most would say their lower abs.
Second, you'll need to sculpt the tough-to-reach section of your rectus abdominus. Technically, your abs are all one muscle, but with the right targeted workout, you can hit the tough-to-train lower section.
This is that workout. Below are four moves that polish off your six-pack. Take 30 seconds of rest between exercises and repeat for two to three sets.