The potency of interval training is nothing new. Many athletes have been straining through interval sessions once or twice a week along with their regular workout for years. But what researchers have been looking at recently is whether humans can increase endurance with only a few minutes of strenuous exercise, instead of hours? Could it be that most of us are spending more time than we need to trying to get fit?

[Read](http://well.blogs.nytimes.com/2009/06/24/can-you-get-fit-in-six-minutes-a-week/ “Read the Article”) (New York Times)