First, a quick physiology lesson: Your rectus abdominis is really one, long muscle that includes both your "upper" and "lower" abs. So, there are no exercises that explicitly isolate either half individually (even though you may "feel the burn" more so in one area than other). Still, there are things you can do to really make that lower area pop, says Don Saladino, CPT, owner of Drive 495.
Number 1, diet is key: remember that training your core muscles alone simply isn’t enough—you need to have discipline in the kitchen, too. (Here are the best foods to expose your abs.)
Last, work in exercises that attack your rectus abdominis and obliques simultaneously for good measure (that V-line is where these two muscles meet).
Here are 25 moves, curated by Men's Fitness Training Director Sean Hyson, C.S.C.S., to add in to your routine.