Inspired by @WhatTheHellAmy 's mytake on getting a flat stomach and a slim waist, I decided to make a supplementary mytake with additional core exercises. They are listed in no particular order.
1. The Hundreds
This one is a pilates' exercise. The video below explains it well. For more of a challenge you could lower your legs below 45 degrees. Personally, when I first started doing this I could only get to 50 or 60 but now I can do 100 with ease.
2. Boat Pose (Navasana)

For some reason, when I first started doing/trying this pose I had a tendency to roll onto my back. Once you find your balance point it becomes easy.
As a variation, you could do half boat pose (ardha navasana) if you have difficulty getting your legs straight.

3. Revolved Boat Pose (Parivrtta Navasana)

Again, you have the option of using bent legs:

4. Revolved Half Moon Pose (Parivrtta Ardha Chandrasana)

5. Yogic Bicycles
Not challenging enough? Try doing it with straight legs:
For an extra challenge you could bring your opposite side hand up towards the lifted foot. If that still isn't enough for you then try strapping on some ankle weights.
6. Holding The Urn

7. Reverse Crunches
This might help get those tricky lower abs.
8. Ab Roller
There are different exercises you could do with an ab roller. Here's one below. Don't let your lower back sag - I think this is what I did the first time I used an ab roller and it isn't comfortable the day after.
9. One-legged Plank (Eka Pada Phalakasana)
Get a leg up on your plank pose. Hold for at least one minute.

10. Mill Churning Pose (Chakki Chalanasana)
This one is good for winding down after your core practice.
11. Reverse Corpse Pose (Advasana)
This one is a counter-pose (pratikryasana). It's good after a difficult core work-out. Lay face down and inhale into your stomach area. Let your breath and the contact with the floor massage your abs.

If you know of any other core exercises please share them below.
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1Opinion
That looks like a mixture of hardcore yoga and training - All good advice - Just thinking of the pain of starting of - Think of the prize Mankini in the summer
media.production.coolgift.com/.../...kini%2002.jpg
that's gross man
Yeah looks uncomfortable as well - Might just stick to trunks
Awesome take!!! All of these are perfect.
I do like 5 of these. Very very hard ones, but with good results.