The 10-20-30 Workout

A new exercise strategy promises to get you into shape in just minutes a day.
1:48 | 07/30/15

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Transcript for The 10-20-30 Workout
what I'm worried about. Anyone who hates time working out, it gets you in shape minutes a day. We learned about it in "The new York times" and our Abbie Boudreau gave it a try. All out. Reporter: It's called the 10-20-30 workout. Interval training by the second. Deep eight seconds. Reporter: A recent study in Denmark at the university of Copenhagen says not hours but just minutes at the gym can add up to real results. So how does it work exactly? It's more than just a minute long workout. It's 30 seconds of slow exercise low intensitile toed by 20 seconds of moderate intensity followed by ten seconds of super high intensity, that's one minute and immediate repeat that 30-20-10. Five times, two minute break. Five times again, actually 12 minutes of working out. Shouldn't it be the opposite, 30-20-10? It sounds better. It's catchy. It's catchy. Three, two, everyone is done. Reporter: Harley Pasternak is a celebrity trainer and author of the new weight loss book called "5 pounds." Believes the workout can be effective for almost everyone. The study says this is for everybody. I would say be careful. Any time you do something exhaustive, or 100% intensity, there's always a risk. Reporter: If you're pregnant like me, Harley says a modified version -- You're going to jog. Reporter: Is good. My workout partner Sydney and I give it a shot attempted the recommended 12 minutes. Coming up on your 20-second speed walk. Perfect. All out. Jog it out. Walk with authority. Pump your arm, kicking up your speed from three miles an hour to four miles an hour. You can definitely feel your heart rate pick up. Yes. Reporter: For "Good morning America," Abbie Boudreau, ABC news, Los Angeles.

This transcript has been automatically generated and may not be 100% accurate.

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