Our expert says:
I don't think you're wasting your time, but that exercise alone is not going to take you do your goal, regardless of whether it's to develop strength/stability, or to get that elusive six-pack. The exercise will work the abs, and also the back, but the only way to achieve both those goals is a combination of those exercises, and also cardiovascular training. If you're doing that, then this exercise is part of the process. But alone, it's not the answer.
Also, do you mean sit-ups rather than push-ups? I'm not 100% sure of your goal or what else you're doing training-wise.
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