I didn't read the article as actually reaching any conclusion as to what is the single best exercise. Rather, several other points stuck out for me: (1) the "best" exercise is one that you enjoy and stick with; (2) that you don't have to engage in that activity for hours on end to get the primary health benefit from it; and (3) that interval training appears to be particularly beneficial. I also like the emphasis on walking as a good exercise. For people who can't do or afford more than that, I think that's important. Certainly, a good portion of the population can't afford many of the toys that most of us on TE have.