30 Jul '13, 7pm

Did you run this morning?

Heading out for two runs in a single day--logging "doubles" or "two-a-days"--is standard practice among elites. But most mortals wouldn't dream of it: not enough time and too much injury risk. "There is a misconception that doubles are something only high-mileage, elite runners do," says Steve Magness, an exercise physiologist and cross-country coach for the University of Houston. "But a lot of runners can benefit from them." Including time-crunched folks trying to squeeze in miles and veterans looking to step things up. For good reason: Studies suggest doubling up and running in a depleted state can boost fat-burning, train the body to use glycogen more efficiently, and stimulate mitochondria production (more mitochondria can delay fatigue). "By shortening the time between runs, you're challenging your body to recover faster," says Greg McMillan, an exercise physiologist ...

Full article: http://www.runnersworld.com/running-tips/pros-and-cons-ru...

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