Interval training alternates periods of moderate-to high-intensity effort (such as sprinting) with periods of low- to moderate-intensity effort (like walking or jogging). It is often contrasted with long duration, “steady state” exercise (like jogging).
High Intensity Interval Training (HIIT) is a popular form of interval training that involves (surprise!) intervals of high intensity. HIIT has been found to boost the metabolism, build lean muscle, and keep the body burning calories up to 48 hours after the workout[1]. HIIT has been shown to be more effective at improving athletic performance and releasing beneficial hormones than steady state exercise[2][3]. While it’s often used in the context of cardiovascular exercise, interval training can be employed with weights, kettlebells, or any form of exercise. Tabata Training and the Little Method are also popular forms of HIIT. more info visit this site
( http://content2read.com/health-articles/rusty-moore-visual-impact-reviews-how-to-do-workout-for-muscular-body )
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