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Can you really shape up in just minutes a day? A quick workout routine - or simple lifestyle changes -- may fit your goals.

With work, family, and social obligations competing for our time, it seems we're all keeping a frantic pace these days. It's hard to find time for a workout routine - and easy to see the allure of quick workouts that promise fitness in just a few minutes a day.

But can these popular programs really do the trick, or are they just another waste of precious time?

Well, say some fitness experts, it all depends on what you're after. Odds are, you won't become an elite athlete or greatly improve the health of your heart if you exercise only in quick workouts. But you might end up a little stronger and a little healthier - and maybe even look a bit better in your bathing suit.

According to online fitness trainer Jorge Cruise, author of the best-selling book 8 Minutes in the Morning: A Simple Way to Burn Fat, short bouts of weight training can help you build muscle mass and boost your metabolism. And that, he says, can help you lose weight.

The quick workout component of Cruise's program consists of doing four sets each of two strength-training exercises (things like push-ups and bicep curls), six days a week. After a quick warm-up, you do one set of 12 repetitions of the first of the day's exercises, then immediately follow with 12 reps of the second exercise. Repeat the cycle three more times and you're done for the day.

The book specifies two different exercises for each day, working chest and back one day; shoulders and abdominals the next; then triceps and biceps; hamstrings and quadriceps; calves and butt; and inner and outer thighs.

"The program is very specific," Cruise tells WebMD. "It has been designed to provide short workouts -- preferably done in the morning -- that will give your metabolism a boost throughout the day."

The eight minutes a day of strength training should help you lose an average of two pounds a week, says Cruise, who also recommends an eating plan emphasizing portion control and "healthy" fats. But Cruise is quick to emphasize that his program is not designed for overall fitness. "This is exclusively for weight loss," he says. "If you want to work on anything else, this is not for you."

Within the fitness industry, Cruise is one of several proponents of short sessions of strength -training exercise. Similar philosophies can be found in the books Power of 10: The Once-a-Week Slow Motion Fitness Revolution by Adam Zickerman and Bill Schley, and Flip the Switch: Discover the Weight-Loss Solution and the Secret of Getting Started by Jim Karas, among others.

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