Can You Get Fit in Six Minutes a Week? - Well Blog - NYTimes.com
http://well.blogs.nytimes.com/2009/06/24/can-you-get-fit-in-six-minutes-a-week/?em

Effictiveness of sprint workouts, especially in swimming. "There’s a catch, though. Those six minutes, if they’re to be effective, must hurt. “We describe it as an ‘all-out’ effort,” Gibala says. You’ll be straying “well out of your comfort zone.” That level of discomfort makes some activities better-suited to intense training than others. “We haven’t studied runners,” Gibala says. The pounding involved in repeated sprinting could lead to injuries, depending on a runner’s experience and stride mechanics. But cycling and swimming work well."

Taleb was right ahead of the curve, again...Maybe there's something to the caveman diet, too...

I'm skeptical, but it sure would be nice