The “Eagle Ab” is popular Army ab exercise; it’s killer and sure to give you a good workout.
Instructions:
1) Start on your back with your body straight. Your head, shoulders, and legs should all be lifted a few inches off the floor and your abs should be engaged. Keep your hands behind your ears, your elbows spread parallel to the floor, and an intense expression on your face. 
2) Slowly lift yourself up into a crunch. The only part of your body touching the floor should be your butt, and your elbows should come between your legs, which will open into a diamond shape with your feet still touching. Maintain intense facial expression.
3) Slowly lower yourself back into the first position (don’t let your legs or shoulders touch the floor!), maintaining control and not moving too quickly, and do it all over again! And again! And again! Don’t stop… come on, you can do one more!!
4) Repeat as many times as you can, and then congratulate yourself on a job well done. 
Give it a try and let me know how it goes! It’s harder than it looks 😉
