This is the exercise for you if...you hate exercise or have no time. No excuses. This works
High-intensity interval training — referred to as H.I.I.T. — is based on the idea that short bursts of strenuous exercise can have a big impact on the body. If moderate exercise — like a 20-minute jog — is good for your heart, lungs and metabolism, H.I.I.T. packs the benefits of that workout and more into a few minutes. It may sound too good to be true, but learning this exercise technique and adapting it to your life can mean saving hours at the gym. If you think you don’t have time to exercise, H.I.I.T. may be the workout for you.
You can try it with any aerobic activity you like. The principles of H.I.I.T. can be applied to running, biking, stair climbing, swimming, jumping rope, rowing, even hopping or skipping. (Yes, skipping!)
The downside? Even though H.I.I.T. lasts only minutes, the workouts are tough, requiring you to push your body near its limit.
Read more: Really Really Short Workouts