5 Reasons why HIIT (high intensity interval training) workouts are A+

1. Efficient
Super-efficient HIIT is the ideal workout for a busy schedule—whether you want to squeeze in a workout during your lunch break or to get in shape for a fast-approaching event. Research shows you can achieve more progress in a mere 15 minutes of interval training (done three times a week) than the girl jogging on the treadmill for an hour. And according to a 2011 study presented at the American College of Sports Medicine Annual Meeting, just 2 weeks of high-intensity intervals improves your aerobic capacity as much as 6 to 8 weeks of endurance training.
That’s not even the best part! Using the Tabata training method, you can complete an effective HIIT workout in just 4 minutes.
2. Burn More Fat
Not only do you burn more calories during HIIT
workouts, but the effect of all that intense exertion kicks your body’s repair cycle into hyperdrive. That means you burn more fat and calories in the 24 hours
after a HIIT workout than you do after, say, a steady-pace run.

3. Healthier Heart
Most people aren’t used to pushing into the anaerobic zone (that lovely place where you can’t breathe and you feel like your heart is trying to jump out of your chest). But in this case, extreme training produces extreme results. One 2006 study found that after 8 weeks of doing HIIT workouts, subjects could bicycle twice as long as they could before the study, while maintaining the same pace.
4. No Equipment Necessary
Running, biking, jump roping, and rowing all work great for HIIT, but you don’t need any equipment to get it done. High knees, fast feet, or anything plyometric like jumping lunges work just as well to get your heart rate up fast. In fact, some equipment like dumbbells can make HIIT lesseffective because you want the focus to be on pushing your heart to its max, not your biceps.
5. Increase Metabolism
In addition to increased fat burning and more muscle preserved, HIIT stimulates production of your human growth hormone (HGH) by up to 450 percent during the 24 hours after you finish your workout. This is great news since HGH is not only responsible for increased caloric burn but also slows down the aging process, making you younger both inside and out!
(Source: shape.com)