Holding the standard plank for ten seconds or longer is useless according to Dr. Stuart McGill. Unfortunately, many people still try to do planks for time.
A better way to progress this core exercise? Make it harder. The cable plank press will help you take your core strength to the next level, and you'll even build some extra upper-body muscle.
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.
Using dead stop movements to blow past a sticking point; how ab work has nothing to do with building a six-pack; and how you should blow-torch the treadmill and burn fat in a way that works.