The fitness industry is a crazy business, especially when it comes to abs. For example, if you want to reveal your six-pack, you generally have two product choices.

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1. The too-easy-to-work method.
You know this better as "5-minute abs!" or some such hype. But if this approach were really effective, even Chris Christie would have a washboard.

2. The so-hard-it-has-to-work method.
Think 60 to 90 minutes of exercise, 6 days a week. Now if you have the time and energy for this kind of regimen, we commend you. But plenty of people are missing one or the other. And that's just reality, not a cop-out.

So we wondered: Could there be an ab-sculpting program that actually works and is doable for most people? For the answer, we turned to Mike Wunsch, C.S.C.S., and Craig Rasmussen, C.S.C.S., creators of Men's Health's newest fat-loss plan, 24-Hour Abs! The answer: "Absolutely," says Wunsch, who teams up with Rasmussen to design the workout programs at Results Fitness in Santa Clarita, California. "That's exactly how we make our living."

The plank strengthens the dozens of muscles between your shoulders and hips.

But if you jack your feet in and out as you do it, the plank suddenly becomes so much more than just a core builder.

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The quick movement of your feet provides a great dynamic stability challenge that makes your abs scream, and ramps up your heart and metabolic rate.

And you can make it even more difficult by changing up your arm positioning. This creates an unbalanced foundation, so you have to work harder to perform the same exercise.

Put it all together using the plank jack complex below. Do each of the following four plank variations for 15 seconds each without resting. Once you’ve completed the fourth exercise, rest one minute. That’s one round. Perform up to five total rounds.

In life, each of us tends to move at our own pace. Some of us walk, talk, and eat faster or slower than others.

Research tells us that different speeds come with different costs and benefits. Walking faster, for example, burns more calories than walking slowly. Those who talk faster are more persuasive. And those who eat fast tend to eat more.

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So someone struggling to lose weight might be advised to eat slower and walk faster, and to beware of fast-talking salesmen trying to push the latest supplement miracle. 

It’s no surprise that in the gym, we also lift at different speeds. The open