Ab exercises for lower abs and v line:
Bicycle crunch, Flat hand crunch, Coffin crunches, Leg lifts, Leg out side crunches, Butt raises, Elbow crunches, Cross-over toe touches. L sits/raises (good for hip flexors)
Any and all of these work the lower abs and v area.
But the MOST effective and quickest way to develop abs and v line (in my experience)... ready for this?
Heavy SQUATS and DEADLIFTS. I don't even do ab work and have a solid 8 pack and v line. I get complements every time I'm in the gym
fyi... This doesn't count if you do Smith machine squats because the smith machine does the work that your core should be doing