This is just the sort of rubbish, incidentally that makes people angry about how science is reported in the press. Especially ironic to find in the Guardian given that Ben Goldacre, who writes (wrote?) for them is one of the most vocal advocates against it.

The text of the article is basically sound, but then the headline ("Brisk walk healthier than running – scientists") and photo comment ("Runners might be better off walking for health, researchers say.") are wildly misleading.