Really?: The Claim: Running Outdoors Burns More Calories

Most avid runners have a strong preference for either pavement or treadmills, but how do the two differ in producing results?

Zrodlo (oryginalny wpis) na http://www.nytimes.com/2008/05/06/health/06real.html?partner=rssnyt&emc=rss,By ANAHAD Oâ機ONNOR