Interval training has many benefits from losing weight to decreasing your resting heart rate! Interval training can be done with any type of cardiovascular activity; for example, running outside or on a treadmill. Sprint for one minute, then jog for one minute, allowing your body to recover. Then repeat.
"The fewer times your heart beats per minute, the less wear and tear there is on the mechanics of the organ. Interval training makes your heart more efficient so it pumps more blood with each beat, reducing the number of beats per minute" (Fitsugar)
Read what Jade Alexis has to say about interval training in the August 2011 issue of Marie Claire (page180) Also learn more about the effectiveness of interval training; 7 reasons to try interval training.
