Whenever possible, add resistance to your ab exercises with weight. Most people increase the load on exercises for major muscle groups but they don't on ab exercises. That's a mistake. Think ankle weights for leg raises or a 45-pound plate for crunches as shown here.
related posts
Tip: Set Up and Pull Your Deadlift Fast
The quick set-up allows you to take advantage of the stretch shortening cycle in your hip extensors. It takes practice, but it should become second nature and fast.
Roll Your Way to Killer Abs!
There's a vicious rumor being spread by unknown parties that you should probably know about. Now, this rumor is pretty ugly so be prepared. Are you ready?
Tip: No Need to Hate on Lifting Straps
Straps are used by pro bodybuilders, figure competitors, strongmen, and even powerlifters, so why the outrage? Here's how to use them wisely.
Tip: Squeeze Press & Flye Combo
This complex starts with the squeeze press. Ideally, use hex dumbbells since you need to squeeze them together hard. Then move on to regular flyes.