Found an Ab Workout

And it is nasty. It is actually a Core Muscle Strength and Stability test.

I found this at PowerCentering, which is a commercial website that promotes a core workout to get in shape. I have no idea how well their products or regimen work, but since I'm showing one of their tests here, I need to give them proper credit.

Here is the test:

The Core Muscle Strength & Stability Test is conducted as follows:

Position the watch on the ground where you can easily see it

1. Assume the basic plank/hover position (elbows on the ground).
2. Hold this position for 60 seconds
3. Lift your right arm off the ground.
4. Hold this position for 15 seconds
5. Return your right arm to the ground and lift the left arm off the ground.
6. Hold this position for 15 seconds
7. Return your left arm to the ground and lift the right leg off the ground.
8. Hold this position for 15 seconds
9. Return your right leg to the ground and lift the left leg off the ground.
10. Hold this position for 15 seconds
11. Return your left leg to ground and lift your right leg and left arm off the ground.
12. Hold this position for 15 seconds
13. Return your right leg and left arm to the ground and lift your left leg and right arm off the ground.
14. Hold this position for 15 seconds
15. Return to the basic plank position (elbows on the ground).
16. Hold this position for 30 seconds

Your score is equal to the number that corresponds to your last completed position (1-16) Your Score = _____________

I'll do this twice a week and see how I improve. It tried it and, sad to say, got a score of 7. Still, what's life without a challenge?