Have you ever wondered why most of our classes involve interval training? 40/20s work/rest ratio (for example) is not picked at random. The folks over at Greatist.com pulled up a great little poster to reveal the science behind interval training, and how it helps build muscle, and lose weight. It’s a simple, quick read and should finally put a nail in the coffin to the common excuse “I don’t have time to work out”. Check it out after the jump.

The Complete Guide to Interval Training

More Health and Fitness News & Tips at Greatist.

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